new uninlined_format_args lint to inline explicit arguments

Implement https://github.com/rust-lang/rust-clippy/issues/8368 - a new
lint to inline format arguments such as `print!("{}", var)` into
`print!("{var}")`.

code | suggestion | comment
---|---|---
`print!("{}", var)` | `print!("{var}")` |  simple variables
`print!("{0}", var)` | `print!("{var}")` |  positional variables
`print!("{v}", v=var)` | `print!("{var}")` |  named variables
`print!("{0} {0}", var)` | `print!("{var} {var}")` |  aliased variables
`print!("{0:1$}", var, width)` | `print!("{var:width$}")` |  width
support
`print!("{0:.1$}", var, prec)` | `print!("{var:.prec$}")` |  precision
support
`print!("{:.*}", prec, var)` | `print!("{var:.prec$}")` |  asterisk
support

code | suggestion | comment
---|---|---
`print!("{0}={1}", var, 1+2)` | `print!("{var}={0}", 1+2)` | Format
string uses an indexed argument that cannot be inlined.  Supporting this
case requires re-indexing of the format string.

changelog: [`uninlined_format_args`]: A new lint to inline format
arguments, i.e. `print!("{}", var)` into `print!("{var}")`
This commit is contained in:
Yuri Astrakhan 2022-09-14 12:25:48 -04:00
parent 57c9daa09b
commit 5a71bbdf3f
15 changed files with 1451 additions and 29 deletions

View file

@ -4274,6 +4274,7 @@ Released 2018-09-13
[`unimplemented`]: https://rust-lang.github.io/rust-clippy/master/index.html#unimplemented
[`uninit_assumed_init`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninit_assumed_init
[`uninit_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninit_vec
[`uninlined_format_args`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
[`unit_arg`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[`unit_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_cmp
[`unit_hash`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_hash

View file

@ -1,16 +1,18 @@
use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
use clippy_utils::is_diag_trait_item;
use clippy_utils::macros::{is_format_macro, FormatArgsExpn};
use clippy_utils::source::snippet_opt;
use clippy_utils::macros::FormatParamKind::{Implicit, Named, Numbered, Starred};
use clippy_utils::macros::{is_format_macro, FormatArgsExpn, FormatParam, FormatParamUsage};
use clippy_utils::source::{expand_past_previous_comma, snippet_opt};
use clippy_utils::ty::implements_trait;
use clippy_utils::{is_diag_trait_item, meets_msrv, msrvs};
use if_chain::if_chain;
use itertools::Itertools;
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind, HirId};
use rustc_hir::{Expr, ExprKind, HirId, Path, QPath};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty::adjustment::{Adjust, Adjustment};
use rustc_middle::ty::Ty;
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_semver::RustcVersion;
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::{sym, ExpnData, ExpnKind, Span, Symbol};
declare_clippy_lint! {
@ -64,7 +66,67 @@ declare_clippy_lint! {
"`to_string` applied to a type that implements `Display` in format args"
}
declare_lint_pass!(FormatArgs => [FORMAT_IN_FORMAT_ARGS, TO_STRING_IN_FORMAT_ARGS]);
declare_clippy_lint! {
/// ### What it does
/// Detect when a variable is not inlined in a format string,
/// and suggests to inline it.
///
/// ### Why is this bad?
/// Non-inlined code is slightly more difficult to read and understand,
/// as it requires arguments to be matched against the format string.
/// The inlined syntax, where allowed, is simpler.
///
/// ### Example
/// ```rust
/// # let var = 42;
/// # let width = 1;
/// # let prec = 2;
/// format!("{}", var);
/// format!("{v:?}", v = var);
/// format!("{0} {0}", var);
/// format!("{0:1$}", var, width);
/// format!("{:.*}", prec, var);
/// ```
/// Use instead:
/// ```rust
/// # let var = 42;
/// # let width = 1;
/// # let prec = 2;
/// format!("{var}");
/// format!("{var:?}");
/// format!("{var} {var}");
/// format!("{var:width$}");
/// format!("{var:.prec$}");
/// ```
///
/// ### Known Problems
///
/// There may be a false positive if the format string is expanded from certain proc macros:
///
/// ```ignore
/// println!(indoc!("{}"), var);
/// ```
///
/// If a format string contains a numbered argument that cannot be inlined
/// nothing will be suggested, e.g. `println!("{0}={1}", var, 1+2)`.
#[clippy::version = "1.65.0"]
pub UNINLINED_FORMAT_ARGS,
pedantic,
"using non-inlined variables in `format!` calls"
}
impl_lint_pass!(FormatArgs => [FORMAT_IN_FORMAT_ARGS, UNINLINED_FORMAT_ARGS, TO_STRING_IN_FORMAT_ARGS]);
pub struct FormatArgs {
msrv: Option<RustcVersion>,
}
impl FormatArgs {
#[must_use]
pub fn new(msrv: Option<RustcVersion>) -> Self {
Self { msrv }
}
}
impl<'tcx> LateLintPass<'tcx> for FormatArgs {
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
@ -86,9 +148,73 @@ impl<'tcx> LateLintPass<'tcx> for FormatArgs {
check_format_in_format_args(cx, outermost_expn_data.call_site, name, arg.param.value);
check_to_string_in_format_args(cx, name, arg.param.value);
}
if meets_msrv(self.msrv, msrvs::FORMAT_ARGS_CAPTURE) {
check_uninlined_args(cx, &format_args, outermost_expn_data.call_site);
}
}
}
}
extract_msrv_attr!(LateContext);
}
fn check_uninlined_args(cx: &LateContext<'_>, args: &FormatArgsExpn<'_>, call_site: Span) {
if args.format_string.span.from_expansion() {
return;
}
let mut fixes = Vec::new();
// If any of the arguments are referenced by an index number,
// and that argument is not a simple variable and cannot be inlined,
// we cannot remove any other arguments in the format string,
// because the index numbers might be wrong after inlining.
// Example of an un-inlinable format: print!("{}{1}", foo, 2)
if !args.params().all(|p| check_one_arg(cx, &p, &mut fixes)) || fixes.is_empty() {
return;
}
// FIXME: Properly ignore a rare case where the format string is wrapped in a macro.
// Example: `format!(indoc!("{}"), foo);`
// If inlined, they will cause a compilation error:
// > to avoid ambiguity, `format_args!` cannot capture variables
// > when the format string is expanded from a macro
// @Alexendoo explanation:
// > indoc! is a proc macro that is producing a string literal with its span
// > set to its input it's not marked as from expansion, and since it's compatible
// > tokenization wise clippy_utils::is_from_proc_macro wouldn't catch it either
// This might be a relatively expensive test, so do it only we are ready to replace.
// See more examples in tests/ui/uninlined_format_args.rs
span_lint_and_then(
cx,
UNINLINED_FORMAT_ARGS,
call_site,
"variables can be used directly in the `format!` string",
|diag| {
diag.multipart_suggestion("change this to", fixes, Applicability::MachineApplicable);
},
);
}
fn check_one_arg(cx: &LateContext<'_>, param: &FormatParam<'_>, fixes: &mut Vec<(Span, String)>) -> bool {
if matches!(param.kind, Implicit | Starred | Named(_) | Numbered)
&& let ExprKind::Path(QPath::Resolved(None, path)) = param.value.kind
&& let Path { span, segments, .. } = path
&& let [segment] = segments
{
let replacement = match param.usage {
FormatParamUsage::Argument => segment.ident.name.to_string(),
FormatParamUsage::Width => format!("{}$", segment.ident.name),
FormatParamUsage::Precision => format!(".{}$", segment.ident.name),
};
fixes.push((param.span, replacement));
let arg_span = expand_past_previous_comma(cx, *span);
fixes.push((arg_span, String::new()));
true // successful inlining, continue checking
} else {
// if we can't inline a numbered argument, we can't continue
param.kind != Numbered
}
}
fn outermost_expn_data(expn_data: ExpnData) -> ExpnData {
@ -170,7 +296,7 @@ fn check_to_string_in_format_args(cx: &LateContext<'_>, name: Symbol, value: &Ex
}
}
// Returns true if `hir_id` is referred to by multiple format params
/// Returns true if `hir_id` is referred to by multiple format params
fn is_aliased(args: &FormatArgsExpn<'_>, hir_id: HirId) -> bool {
args.params()
.filter(|param| param.value.hir_id == hir_id)

View file

@ -159,6 +159,7 @@ store.register_lints(&[
format::USELESS_FORMAT,
format_args::FORMAT_IN_FORMAT_ARGS,
format_args::TO_STRING_IN_FORMAT_ARGS,
format_args::UNINLINED_FORMAT_ARGS,
format_impl::PRINT_IN_FORMAT_IMPL,
format_impl::RECURSIVE_FORMAT_IMPL,
format_push_string::FORMAT_PUSH_STRING,

View file

@ -29,6 +29,7 @@ store.register_group(true, "clippy::pedantic", Some("clippy_pedantic"), vec![
LintId::of(eta_reduction::REDUNDANT_CLOSURE_FOR_METHOD_CALLS),
LintId::of(excessive_bools::FN_PARAMS_EXCESSIVE_BOOLS),
LintId::of(excessive_bools::STRUCT_EXCESSIVE_BOOLS),
LintId::of(format_args::UNINLINED_FORMAT_ARGS),
LintId::of(functions::MUST_USE_CANDIDATE),
LintId::of(functions::TOO_MANY_LINES),
LintId::of(if_not_else::IF_NOT_ELSE),

View file

@ -855,7 +855,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
))
});
store.register_late_pass(move || Box::new(undocumented_unsafe_blocks::UndocumentedUnsafeBlocks));
store.register_late_pass(move || Box::new(format_args::FormatArgs));
store.register_late_pass(move || Box::new(format_args::FormatArgs::new(msrv)));
store.register_late_pass(|| Box::new(trailing_empty_array::TrailingEmptyArray));
store.register_early_pass(|| Box::new(octal_escapes::OctalEscapes));
store.register_late_pass(|| Box::new(needless_late_init::NeedlessLateInit));

View file

@ -213,7 +213,7 @@ define_Conf! {
///
/// Suppress lints whenever the suggested change would cause breakage for other crates.
(avoid_breaking_exported_api: bool = true),
/// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS, ERR_EXPECT, CAST_ABS_TO_UNSIGNED.
/// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS, ERR_EXPECT, CAST_ABS_TO_UNSIGNED, UNINLINED_FORMAT_ARGS.
///
/// The minimum rust version that the project supports
(msrv: Option<String> = None),

View file

@ -1,12 +1,12 @@
use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
use clippy_utils::macros::{root_macro_call_first_node, FormatArgsExpn, MacroCall};
use clippy_utils::source::snippet_opt;
use clippy_utils::source::{expand_past_previous_comma, snippet_opt};
use rustc_ast::LitKind;
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind, HirIdMap, Impl, Item, ItemKind};
use rustc_lint::{LateContext, LateLintPass, LintContext};
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::{sym, BytePos, Span};
use rustc_span::{sym, BytePos};
declare_clippy_lint! {
/// ### What it does
@ -542,10 +542,3 @@ fn conservative_unescape(literal: &str) -> Result<String, UnescapeErr> {
if err { Err(UnescapeErr::Lint) } else { Ok(unescaped) }
}
// Expand from `writeln!(o, "")` to `writeln!(o, "")`
// ^^ ^^^^
fn expand_past_previous_comma(cx: &LateContext<'_>, span: Span) -> Span {
let extended = cx.sess().source_map().span_extend_to_prev_char(span, ',', true);
extended.with_lo(extended.lo() - BytePos(1))
}

View file

@ -545,19 +545,32 @@ fn span_from_inner(base: SpanData, inner: rpf::InnerSpan) -> Span {
)
}
/// How a format parameter is used in the format string
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum FormatParamKind {
/// An implicit parameter , such as `{}` or `{:?}`.
Implicit,
/// A parameter with an explicit number, or an asterisk precision. e.g. `{1}`, `{0:?}`,
/// `{:.0$}` or `{:.*}`.
/// A parameter with an explicit number, e.g. `{1}`, `{0:?}`, or `{:.0$}`
Numbered,
/// A parameter with an asterisk precision. e.g. `{:.*}`.
Starred,
/// A named parameter with a named `value_arg`, such as the `x` in `format!("{x}", x = 1)`.
Named(Symbol),
/// An implicit named parameter, such as the `y` in `format!("{y}")`.
NamedInline(Symbol),
}
/// Where a format parameter is being used in the format string
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum FormatParamUsage {
/// Appears as an argument, e.g. `format!("{}", foo)`
Argument,
/// Appears as a width, e.g. `format!("{:width$}", foo, width = 1)`
Width,
/// Appears as a precision, e.g. `format!("{:.precision$}", foo, precision = 1)`
Precision,
}
/// A `FormatParam` is any place in a `FormatArgument` that refers to a supplied value, e.g.
///
/// ```
@ -573,6 +586,8 @@ pub struct FormatParam<'tcx> {
pub value: &'tcx Expr<'tcx>,
/// How this parameter refers to its `value`.
pub kind: FormatParamKind,
/// Where this format param is being used - argument/width/precision
pub usage: FormatParamUsage,
/// Span of the parameter, may be zero width. Includes the whitespace of implicit parameters.
///
/// ```text
@ -585,6 +600,7 @@ pub struct FormatParam<'tcx> {
impl<'tcx> FormatParam<'tcx> {
fn new(
mut kind: FormatParamKind,
usage: FormatParamUsage,
position: usize,
inner: rpf::InnerSpan,
values: &FormatArgsValues<'tcx>,
@ -599,7 +615,12 @@ impl<'tcx> FormatParam<'tcx> {
kind = FormatParamKind::NamedInline(name);
}
Some(Self { value, kind, span })
Some(Self {
value,
kind,
usage,
span,
})
}
}
@ -618,6 +639,7 @@ pub enum Count<'tcx> {
impl<'tcx> Count<'tcx> {
fn new(
usage: FormatParamUsage,
count: rpf::Count<'_>,
position: Option<usize>,
inner: Option<rpf::InnerSpan>,
@ -625,15 +647,27 @@ impl<'tcx> Count<'tcx> {
) -> Option<Self> {
Some(match count {
rpf::Count::CountIs(val) => Self::Is(val, span_from_inner(values.format_string_span, inner?)),
rpf::Count::CountIsName(name, span) => Self::Param(FormatParam::new(
rpf::Count::CountIsName(name, _) => Self::Param(FormatParam::new(
FormatParamKind::Named(Symbol::intern(name)),
usage,
position?,
span,
inner?,
values,
)?),
rpf::Count::CountIsParam(_) => Self::Param(FormatParam::new(
FormatParamKind::Numbered,
usage,
position?,
inner?,
values,
)?),
rpf::Count::CountIsStar(_) => Self::Param(FormatParam::new(
FormatParamKind::Starred,
usage,
position?,
inner?,
values,
)?),
rpf::Count::CountIsParam(_) | rpf::Count::CountIsStar(_) => {
Self::Param(FormatParam::new(FormatParamKind::Numbered, position?, inner?, values)?)
},
rpf::Count::CountImplied => Self::Implied,
})
}
@ -676,8 +710,20 @@ impl<'tcx> FormatSpec<'tcx> {
fill: spec.fill,
align: spec.align,
flags: spec.flags,
precision: Count::new(spec.precision, positions.precision, spec.precision_span, values)?,
width: Count::new(spec.width, positions.width, spec.width_span, values)?,
precision: Count::new(
FormatParamUsage::Precision,
spec.precision,
positions.precision,
spec.precision_span,
values,
)?,
width: Count::new(
FormatParamUsage::Width,
spec.width,
positions.width,
spec.width_span,
values,
)?,
r#trait: match spec.ty {
"" => sym::Display,
"?" => sym::Debug,
@ -723,7 +769,7 @@ pub struct FormatArg<'tcx> {
pub struct FormatArgsExpn<'tcx> {
/// The format string literal.
pub format_string: FormatString,
// The format arguments, such as `{:?}`.
/// The format arguments, such as `{:?}`.
pub args: Vec<FormatArg<'tcx>>,
/// Has an added newline due to `println!()`/`writeln!()`/etc. The last format string part will
/// include this added newline.
@ -797,6 +843,7 @@ impl<'tcx> FormatArgsExpn<'tcx> {
// NamedInline is handled by `FormatParam::new()`
rpf::Position::ArgumentNamed(name) => FormatParamKind::Named(Symbol::intern(name)),
},
FormatParamUsage::Argument,
position.value,
parsed_arg.position_span,
&values,

View file

@ -13,6 +13,7 @@ macro_rules! msrv_aliases {
// names may refer to stabilized feature flags or library items
msrv_aliases! {
1,62,0 { BOOL_THEN_SOME }
1,58,0 { FORMAT_ARGS_CAPTURE }
1,53,0 { OR_PATTERNS, MANUAL_BITS, BTREE_MAP_RETAIN, BTREE_SET_RETAIN, ARRAY_INTO_ITERATOR }
1,52,0 { STR_SPLIT_ONCE, REM_EUCLID_CONST }
1,51,0 { BORROW_AS_PTR, UNSIGNED_ABS }

View file

@ -392,6 +392,16 @@ pub fn trim_span(sm: &SourceMap, span: Span) -> Span {
.span()
}
/// Expand a span to include a preceding comma
/// ```rust,ignore
/// writeln!(o, "") -> writeln!(o, "")
/// ^^ ^^^^
/// ```
pub fn expand_past_previous_comma(cx: &LateContext<'_>, span: Span) -> Span {
let extended = cx.sess().source_map().span_extend_to_prev_char(span, ',', true);
extended.with_lo(extended.lo() - BytePos(1))
}
#[cfg(test)]
mod test {
use super::{reindent_multiline, without_block_comments};

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@ -521,6 +521,7 @@ docs! {
"unimplemented",
"uninit_assumed_init",
"uninit_vec",
"uninlined_format_args",
"unit_arg",
"unit_cmp",
"unit_hash",

View file

@ -0,0 +1,36 @@
### What it does
Detect when a variable is not inlined in a format string,
and suggests to inline it.
### Why is this bad?
Non-inlined code is slightly more difficult to read and understand,
as it requires arguments to be matched against the format string.
The inlined syntax, where allowed, is simpler.
### Example
```
format!("{}", var);
format!("{v:?}", v = var);
format!("{0} {0}", var);
format!("{0:1$}", var, width);
format!("{:.*}", prec, var);
```
Use instead:
```
format!("{var}");
format!("{var:?}");
format!("{var} {var}");
format!("{var:width$}");
format!("{var:.prec$}");
```
### Known Problems
There may be a false positive if the format string is expanded from certain proc macros:
```
println!(indoc!("{}"), var);
```
If a format string contains a numbered argument that cannot be inlined
nothing will be suggested, e.g. `println!("{0}={1}", var, 1+2)`.

View file

@ -0,0 +1,168 @@
// run-rustfix
#![allow(clippy::eq_op)]
#![allow(clippy::format_in_format_args)]
#![allow(clippy::print_literal)]
#![allow(named_arguments_used_positionally)]
#![allow(unused_variables, unused_imports, unused_macros)]
#![warn(clippy::uninlined_format_args)]
#![feature(custom_inner_attributes)]
macro_rules! no_param_str {
() => {
"{}"
};
}
macro_rules! pass_through {
($expr:expr) => {
$expr
};
}
macro_rules! my_println {
($($args:tt),*) => {{
println!($($args),*)
}};
}
macro_rules! my_println_args {
($($args:tt),*) => {{
println!("foo: {}", format_args!($($args),*))
}};
}
fn tester(fn_arg: i32) {
let local_i32 = 1;
let local_f64 = 2.0;
let local_opt: Option<i32> = Some(3);
let width = 4;
let prec = 5;
let val = 6;
// make sure this file hasn't been corrupted with tabs converted to spaces
// let _ = ' '; // <- this is a single tab character
let _: &[u8; 3] = b" "; // <- <tab><space><tab>
println!("val='{local_i32}'");
println!("val='{local_i32}'"); // 3 spaces
println!("val='{local_i32}'"); // tab
println!("val='{local_i32}'"); // space+tab
println!("val='{local_i32}'"); // tab+space
println!(
"val='{local_i32}'"
);
println!("{local_i32}");
println!("{fn_arg}");
println!("{local_i32:?}");
println!("{local_i32:#?}");
println!("{local_i32:4}");
println!("{local_i32:04}");
println!("{local_i32:<3}");
println!("{local_i32:#010x}");
println!("{local_f64:.1}");
println!("Hello {} is {local_f64:.local_i32$}", "x");
println!("Hello {local_i32} is {local_f64:.*}", 5);
println!("Hello {local_i32} is {local_f64:.*}", 5);
println!("{local_i32} {local_f64}");
println!("{local_i32}, {}", local_opt.unwrap());
println!("{val}");
println!("{val}");
println!("{} {1}", local_i32, 42);
println!("val='{local_i32}'");
println!("val='{local_i32}'");
println!("val='{local_i32}'");
println!("val='{fn_arg}'");
println!("{local_i32}");
println!("{local_i32:?}");
println!("{local_i32:#?}");
println!("{local_i32:04}");
println!("{local_i32:<3}");
println!("{local_i32:#010x}");
println!("{local_f64:.1}");
println!("{local_i32} {local_i32}");
println!("{local_f64} {local_i32} {local_i32} {local_f64}");
println!("{local_i32} {local_f64}");
println!("{local_f64} {local_i32}");
println!("{local_f64} {local_i32} {local_f64} {local_i32}");
println!("{1} {0}", "str", local_i32);
println!("{local_i32}");
println!("{local_i32:width$}");
println!("{local_i32:width$}");
println!("{local_i32:.prec$}");
println!("{local_i32:.prec$}");
println!("{val:val$}");
println!("{val:val$}");
println!("{val:val$.val$}");
println!("{val:val$.val$}");
println!("{val:val$.val$}");
println!("{val:val$.val$}");
println!("{val:val$.val$}");
println!("{val:val$.val$}");
println!("{val:val$.val$}");
println!("{val:val$.val$}");
println!("{width:width$}");
println!("{local_i32:width$}");
println!("{width:width$}");
println!("{local_i32:width$}");
println!("{prec:.prec$}");
println!("{local_i32:.prec$}");
println!("{prec:.prec$}");
println!("{local_i32:.prec$}");
println!("{width:width$.prec$}");
println!("{width:width$.prec$}");
println!("{local_f64:width$.prec$}");
println!("{local_f64:width$.prec$} {local_f64} {width} {prec}");
println!(
"{local_i32:width$.prec$} {local_i32:prec$.width$} {width:local_i32$.prec$} {width:prec$.local_i32$} {prec:local_i32$.width$} {prec:width$.local_i32$}",
);
println!(
"{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$} {3}",
local_i32,
width,
prec,
1 + 2
);
println!("Width = {local_i32}, value with width = {local_f64:local_i32$}");
println!("{local_i32:width$.prec$}");
println!("{width:width$.prec$}");
println!("{}", format!("{local_i32}"));
my_println!("{}", local_i32);
my_println_args!("{}", local_i32);
// these should NOT be modified by the lint
println!(concat!("nope ", "{}"), local_i32);
println!("val='{local_i32}'");
println!("val='{local_i32 }'");
println!("val='{local_i32 }'"); // with tab
println!("val='{local_i32\n}'");
println!("{}", usize::MAX);
println!("{}", local_opt.unwrap());
println!(
"val='{local_i32
}'"
);
println!(no_param_str!(), local_i32);
// FIXME: bugs!
// println!(pass_through!("foo={local_i32}"), local_i32 = local_i32);
// println!(pass_through!("foo={}"), local_i32);
// println!(indoc!("foo={}"), local_i32);
// printdoc!("foo={}", local_i32);
}
fn main() {
tester(42);
}
fn _under_msrv() {
#![clippy::msrv = "1.57"]
let local_i32 = 1;
println!("don't expand='{}'", local_i32);
}
fn _meets_msrv() {
#![clippy::msrv = "1.58"]
let local_i32 = 1;
println!("expand='{local_i32}'");
}

View file

@ -0,0 +1,171 @@
// run-rustfix
#![allow(clippy::eq_op)]
#![allow(clippy::format_in_format_args)]
#![allow(clippy::print_literal)]
#![allow(named_arguments_used_positionally)]
#![allow(unused_variables, unused_imports, unused_macros)]
#![warn(clippy::uninlined_format_args)]
#![feature(custom_inner_attributes)]
macro_rules! no_param_str {
() => {
"{}"
};
}
macro_rules! pass_through {
($expr:expr) => {
$expr
};
}
macro_rules! my_println {
($($args:tt),*) => {{
println!($($args),*)
}};
}
macro_rules! my_println_args {
($($args:tt),*) => {{
println!("foo: {}", format_args!($($args),*))
}};
}
fn tester(fn_arg: i32) {
let local_i32 = 1;
let local_f64 = 2.0;
let local_opt: Option<i32> = Some(3);
let width = 4;
let prec = 5;
let val = 6;
// make sure this file hasn't been corrupted with tabs converted to spaces
// let _ = ' '; // <- this is a single tab character
let _: &[u8; 3] = b" "; // <- <tab><space><tab>
println!("val='{}'", local_i32);
println!("val='{ }'", local_i32); // 3 spaces
println!("val='{ }'", local_i32); // tab
println!("val='{ }'", local_i32); // space+tab
println!("val='{ }'", local_i32); // tab+space
println!(
"val='{
}'",
local_i32
);
println!("{}", local_i32);
println!("{}", fn_arg);
println!("{:?}", local_i32);
println!("{:#?}", local_i32);
println!("{:4}", local_i32);
println!("{:04}", local_i32);
println!("{:<3}", local_i32);
println!("{:#010x}", local_i32);
println!("{:.1}", local_f64);
println!("Hello {} is {:.*}", "x", local_i32, local_f64);
println!("Hello {} is {:.*}", local_i32, 5, local_f64);
println!("Hello {} is {2:.*}", local_i32, 5, local_f64);
println!("{} {}", local_i32, local_f64);
println!("{}, {}", local_i32, local_opt.unwrap());
println!("{}", val);
println!("{}", v = val);
println!("{} {1}", local_i32, 42);
println!("val='{\t }'", local_i32);
println!("val='{\n }'", local_i32);
println!("val='{local_i32}'", local_i32 = local_i32);
println!("val='{local_i32}'", local_i32 = fn_arg);
println!("{0}", local_i32);
println!("{0:?}", local_i32);
println!("{0:#?}", local_i32);
println!("{0:04}", local_i32);
println!("{0:<3}", local_i32);
println!("{0:#010x}", local_i32);
println!("{0:.1}", local_f64);
println!("{0} {0}", local_i32);
println!("{1} {} {0} {}", local_i32, local_f64);
println!("{0} {1}", local_i32, local_f64);
println!("{1} {0}", local_i32, local_f64);
println!("{1} {0} {1} {0}", local_i32, local_f64);
println!("{1} {0}", "str", local_i32);
println!("{v}", v = local_i32);
println!("{local_i32:0$}", width);
println!("{local_i32:w$}", w = width);
println!("{local_i32:.0$}", prec);
println!("{local_i32:.p$}", p = prec);
println!("{:0$}", v = val);
println!("{0:0$}", v = val);
println!("{:0$.0$}", v = val);
println!("{0:0$.0$}", v = val);
println!("{0:0$.v$}", v = val);
println!("{0:v$.0$}", v = val);
println!("{v:0$.0$}", v = val);
println!("{v:v$.0$}", v = val);
println!("{v:0$.v$}", v = val);
println!("{v:v$.v$}", v = val);
println!("{:0$}", width);
println!("{:1$}", local_i32, width);
println!("{:w$}", w = width);
println!("{:w$}", local_i32, w = width);
println!("{:.0$}", prec);
println!("{:.1$}", local_i32, prec);
println!("{:.p$}", p = prec);
println!("{:.p$}", local_i32, p = prec);
println!("{:0$.1$}", width, prec);
println!("{:0$.w$}", width, w = prec);
println!("{:1$.2$}", local_f64, width, prec);
println!("{:1$.2$} {0} {1} {2}", local_f64, width, prec);
println!(
"{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}",
local_i32, width, prec,
);
println!(
"{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$} {3}",
local_i32,
width,
prec,
1 + 2
);
println!("Width = {}, value with width = {:0$}", local_i32, local_f64);
println!("{:w$.p$}", local_i32, w = width, p = prec);
println!("{:w$.p$}", w = width, p = prec);
println!("{}", format!("{}", local_i32));
my_println!("{}", local_i32);
my_println_args!("{}", local_i32);
// these should NOT be modified by the lint
println!(concat!("nope ", "{}"), local_i32);
println!("val='{local_i32}'");
println!("val='{local_i32 }'");
println!("val='{local_i32 }'"); // with tab
println!("val='{local_i32\n}'");
println!("{}", usize::MAX);
println!("{}", local_opt.unwrap());
println!(
"val='{local_i32
}'"
);
println!(no_param_str!(), local_i32);
// FIXME: bugs!
// println!(pass_through!("foo={local_i32}"), local_i32 = local_i32);
// println!(pass_through!("foo={}"), local_i32);
// println!(indoc!("foo={}"), local_i32);
// printdoc!("foo={}", local_i32);
}
fn main() {
tester(42);
}
fn _under_msrv() {
#![clippy::msrv = "1.57"]
let local_i32 = 1;
println!("don't expand='{}'", local_i32);
}
fn _meets_msrv() {
#![clippy::msrv = "1.58"]
let local_i32 = 1;
println!("expand='{}'", local_i32);
}

View file

@ -0,0 +1,866 @@
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:47:5
|
LL | println!("val='{}'", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `-D clippy::uninlined-format-args` implied by `-D warnings`
help: change this to
|
LL - println!("val='{}'", local_i32);
LL + println!("val='{local_i32}'");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:48:5
|
LL | println!("val='{ }'", local_i32); // 3 spaces
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("val='{ }'", local_i32); // 3 spaces
LL + println!("val='{local_i32}'"); // 3 spaces
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:49:5
|
LL | println!("val='{ }'", local_i32); // tab
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("val='{ }'", local_i32); // tab
LL + println!("val='{local_i32}'"); // tab
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:50:5
|
LL | println!("val='{ }'", local_i32); // space+tab
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("val='{ }'", local_i32); // space+tab
LL + println!("val='{local_i32}'"); // space+tab
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:51:5
|
LL | println!("val='{ }'", local_i32); // tab+space
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("val='{ }'", local_i32); // tab+space
LL + println!("val='{local_i32}'"); // tab+space
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:52:5
|
LL | / println!(
LL | | "val='{
LL | | }'",
LL | | local_i32
LL | | );
| |_____^
|
help: change this to
|
LL - "val='{
LL + "val='{local_i32}'"
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:57:5
|
LL | println!("{}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{}", local_i32);
LL + println!("{local_i32}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:58:5
|
LL | println!("{}", fn_arg);
| ^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{}", fn_arg);
LL + println!("{fn_arg}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:59:5
|
LL | println!("{:?}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:?}", local_i32);
LL + println!("{local_i32:?}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:60:5
|
LL | println!("{:#?}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:#?}", local_i32);
LL + println!("{local_i32:#?}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:61:5
|
LL | println!("{:4}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:4}", local_i32);
LL + println!("{local_i32:4}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:62:5
|
LL | println!("{:04}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:04}", local_i32);
LL + println!("{local_i32:04}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:63:5
|
LL | println!("{:<3}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:<3}", local_i32);
LL + println!("{local_i32:<3}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:64:5
|
LL | println!("{:#010x}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:#010x}", local_i32);
LL + println!("{local_i32:#010x}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:65:5
|
LL | println!("{:.1}", local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:.1}", local_f64);
LL + println!("{local_f64:.1}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:66:5
|
LL | println!("Hello {} is {:.*}", "x", local_i32, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("Hello {} is {:.*}", "x", local_i32, local_f64);
LL + println!("Hello {} is {local_f64:.local_i32$}", "x");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:67:5
|
LL | println!("Hello {} is {:.*}", local_i32, 5, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("Hello {} is {:.*}", local_i32, 5, local_f64);
LL + println!("Hello {local_i32} is {local_f64:.*}", 5);
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:68:5
|
LL | println!("Hello {} is {2:.*}", local_i32, 5, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("Hello {} is {2:.*}", local_i32, 5, local_f64);
LL + println!("Hello {local_i32} is {local_f64:.*}", 5);
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:69:5
|
LL | println!("{} {}", local_i32, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{} {}", local_i32, local_f64);
LL + println!("{local_i32} {local_f64}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:70:5
|
LL | println!("{}, {}", local_i32, local_opt.unwrap());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{}, {}", local_i32, local_opt.unwrap());
LL + println!("{local_i32}, {}", local_opt.unwrap());
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:71:5
|
LL | println!("{}", val);
| ^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{}", val);
LL + println!("{val}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:72:5
|
LL | println!("{}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{}", v = val);
LL + println!("{val}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:74:5
|
LL | println!("val='{/t }'", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("val='{/t }'", local_i32);
LL + println!("val='{local_i32}'");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:75:5
|
LL | println!("val='{/n }'", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("val='{/n }'", local_i32);
LL + println!("val='{local_i32}'");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:76:5
|
LL | println!("val='{local_i32}'", local_i32 = local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("val='{local_i32}'", local_i32 = local_i32);
LL + println!("val='{local_i32}'");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:77:5
|
LL | println!("val='{local_i32}'", local_i32 = fn_arg);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("val='{local_i32}'", local_i32 = fn_arg);
LL + println!("val='{fn_arg}'");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:78:5
|
LL | println!("{0}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0}", local_i32);
LL + println!("{local_i32}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:79:5
|
LL | println!("{0:?}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:?}", local_i32);
LL + println!("{local_i32:?}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:80:5
|
LL | println!("{0:#?}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:#?}", local_i32);
LL + println!("{local_i32:#?}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:81:5
|
LL | println!("{0:04}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:04}", local_i32);
LL + println!("{local_i32:04}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:82:5
|
LL | println!("{0:<3}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:<3}", local_i32);
LL + println!("{local_i32:<3}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:83:5
|
LL | println!("{0:#010x}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:#010x}", local_i32);
LL + println!("{local_i32:#010x}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:84:5
|
LL | println!("{0:.1}", local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:.1}", local_f64);
LL + println!("{local_f64:.1}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:85:5
|
LL | println!("{0} {0}", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0} {0}", local_i32);
LL + println!("{local_i32} {local_i32}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:86:5
|
LL | println!("{1} {} {0} {}", local_i32, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{1} {} {0} {}", local_i32, local_f64);
LL + println!("{local_f64} {local_i32} {local_i32} {local_f64}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:87:5
|
LL | println!("{0} {1}", local_i32, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0} {1}", local_i32, local_f64);
LL + println!("{local_i32} {local_f64}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:88:5
|
LL | println!("{1} {0}", local_i32, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{1} {0}", local_i32, local_f64);
LL + println!("{local_f64} {local_i32}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:89:5
|
LL | println!("{1} {0} {1} {0}", local_i32, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{1} {0} {1} {0}", local_i32, local_f64);
LL + println!("{local_f64} {local_i32} {local_f64} {local_i32}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:91:5
|
LL | println!("{v}", v = local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{v}", v = local_i32);
LL + println!("{local_i32}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:92:5
|
LL | println!("{local_i32:0$}", width);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{local_i32:0$}", width);
LL + println!("{local_i32:width$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:93:5
|
LL | println!("{local_i32:w$}", w = width);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{local_i32:w$}", w = width);
LL + println!("{local_i32:width$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:94:5
|
LL | println!("{local_i32:.0$}", prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{local_i32:.0$}", prec);
LL + println!("{local_i32:.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:95:5
|
LL | println!("{local_i32:.p$}", p = prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{local_i32:.p$}", p = prec);
LL + println!("{local_i32:.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:96:5
|
LL | println!("{:0$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:0$}", v = val);
LL + println!("{val:val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:97:5
|
LL | println!("{0:0$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:0$}", v = val);
LL + println!("{val:val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:98:5
|
LL | println!("{:0$.0$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:0$.0$}", v = val);
LL + println!("{val:val$.val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:99:5
|
LL | println!("{0:0$.0$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:0$.0$}", v = val);
LL + println!("{val:val$.val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:100:5
|
LL | println!("{0:0$.v$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:0$.v$}", v = val);
LL + println!("{val:val$.val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:101:5
|
LL | println!("{0:v$.0$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{0:v$.0$}", v = val);
LL + println!("{val:val$.val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:102:5
|
LL | println!("{v:0$.0$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{v:0$.0$}", v = val);
LL + println!("{val:val$.val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:103:5
|
LL | println!("{v:v$.0$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{v:v$.0$}", v = val);
LL + println!("{val:val$.val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:104:5
|
LL | println!("{v:0$.v$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{v:0$.v$}", v = val);
LL + println!("{val:val$.val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:105:5
|
LL | println!("{v:v$.v$}", v = val);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{v:v$.v$}", v = val);
LL + println!("{val:val$.val$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:106:5
|
LL | println!("{:0$}", width);
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:0$}", width);
LL + println!("{width:width$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:107:5
|
LL | println!("{:1$}", local_i32, width);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:1$}", local_i32, width);
LL + println!("{local_i32:width$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:108:5
|
LL | println!("{:w$}", w = width);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:w$}", w = width);
LL + println!("{width:width$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:109:5
|
LL | println!("{:w$}", local_i32, w = width);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:w$}", local_i32, w = width);
LL + println!("{local_i32:width$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:110:5
|
LL | println!("{:.0$}", prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:.0$}", prec);
LL + println!("{prec:.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:111:5
|
LL | println!("{:.1$}", local_i32, prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:.1$}", local_i32, prec);
LL + println!("{local_i32:.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:112:5
|
LL | println!("{:.p$}", p = prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:.p$}", p = prec);
LL + println!("{prec:.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:113:5
|
LL | println!("{:.p$}", local_i32, p = prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:.p$}", local_i32, p = prec);
LL + println!("{local_i32:.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:114:5
|
LL | println!("{:0$.1$}", width, prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:0$.1$}", width, prec);
LL + println!("{width:width$.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:115:5
|
LL | println!("{:0$.w$}", width, w = prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:0$.w$}", width, w = prec);
LL + println!("{width:width$.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:116:5
|
LL | println!("{:1$.2$}", local_f64, width, prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:1$.2$}", local_f64, width, prec);
LL + println!("{local_f64:width$.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:117:5
|
LL | println!("{:1$.2$} {0} {1} {2}", local_f64, width, prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:1$.2$} {0} {1} {2}", local_f64, width, prec);
LL + println!("{local_f64:width$.prec$} {local_f64} {width} {prec}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:118:5
|
LL | / println!(
LL | | "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}",
LL | | local_i32, width, prec,
LL | | );
| |_____^
|
help: change this to
|
LL ~ "{local_i32:width$.prec$} {local_i32:prec$.width$} {width:local_i32$.prec$} {width:prec$.local_i32$} {prec:local_i32$.width$} {prec:width$.local_i32$}", width, prec,
LL ~ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}", width, prec,
LL ~ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}", width, prec,
LL ~ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}", width, prec,
LL ~ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}", width, prec,
LL ~ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}",
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:129:5
|
LL | println!("Width = {}, value with width = {:0$}", local_i32, local_f64);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("Width = {}, value with width = {:0$}", local_i32, local_f64);
LL + println!("Width = {local_i32}, value with width = {local_f64:local_i32$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:130:5
|
LL | println!("{:w$.p$}", local_i32, w = width, p = prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:w$.p$}", local_i32, w = width, p = prec);
LL + println!("{local_i32:width$.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:131:5
|
LL | println!("{:w$.p$}", w = width, p = prec);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{:w$.p$}", w = width, p = prec);
LL + println!("{width:width$.prec$}");
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:132:20
|
LL | println!("{}", format!("{}", local_i32));
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("{}", format!("{}", local_i32));
LL + println!("{}", format!("{local_i32}"));
|
error: variables can be used directly in the `format!` string
--> $DIR/uninlined_format_args.rs:170:5
|
LL | println!("expand='{}'", local_i32);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
help: change this to
|
LL - println!("expand='{}'", local_i32);
LL + println!("expand='{local_i32}'");
|
error: aborting due to 71 previous errors