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Merge pull request #3127 from mikerite/fix-2937

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Fix 2937
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mikerite 2018-10-11 06:22:02 +02:00 committed by GitHub
commit 31eb3b73d3
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3 changed files with 59 additions and 36 deletions
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24
clippy_lints/src/methods/mod.rs
View file

@ -1069,12 +1069,19 @@ fn lint_or_fun_call(cx: &LateContext<'_, '_>, expr: &hir::Expr, method_span: Spa
/// Checks for the `EXPECT_FUN_CALL` lint.
fn lint_expect_fun_call(cx: &LateContext<'_, '_>, expr: &hir::Expr, method_span: Span, name: &str, args: &[hir::Expr]) {
fn extract_format_args(arg: &hir::Expr) -> Option<&hir::HirVec<hir::Expr>> {
if let hir::ExprKind::AddrOf(_, ref addr_of) = arg.node {
if let hir::ExprKind::Call(ref inner_fun, ref inner_args) = addr_of.node {
if is_expn_of(inner_fun.span, "format").is_some() && inner_args.len() == 1 {
if let hir::ExprKind::Call(_, ref format_args) = inner_args[0].node {
return Some(format_args);
}
let arg = match &arg.node {
hir::ExprKind::AddrOf(_, expr)=> expr,
hir::ExprKind::MethodCall(method_name, _, args)
if method_name.ident.name == "as_str" ||
method_name.ident.name == "as_ref"
=> &args[0],
_ => arg,
};
if let hir::ExprKind::Call(ref inner_fun, ref inner_args) = arg.node {
if is_expn_of(inner_fun.span, "format").is_some() && inner_args.len() == 1 {
if let hir::ExprKind::Call(_, ref format_args) = inner_args[0].node {
return Some(format_args);
}
}
}
@ -1111,7 +1118,8 @@ fn lint_expect_fun_call(cx: &LateContext<'_, '_>, expr: &hir::Expr, method_span:
| hir::ExprKind::MethodCall(..)
// These variants are debatable or require further examination
| hir::ExprKind::If(..)
| hir::ExprKind::Match(..) => true,
| hir::ExprKind::Match(..)
| hir::ExprKind::Block{ .. } => true,
_ => false,
}
}
@ -1165,7 +1173,7 @@ fn lint_expect_fun_call(cx: &LateContext<'_, '_>, expr: &hir::Expr, method_span:
span_replace_word,
&format!("use of `{}` followed by a function call", name),
"try this",
format!("unwrap_or_else({} panic!({}))", closure, sugg),
format!("unwrap_or_else({} {{ let msg = {}; panic!(msg) }}))", closure, sugg),
);
}

5
tests/ui/methods.rs
View file

@ -14,7 +14,7 @@
#![warn(clippy::all, clippy::pedantic, clippy::option_unwrap_used)]
#![allow(clippy::blacklisted_name, unused, clippy::print_stdout, clippy::non_ascii_literal, clippy::new_without_default,
clippy::new_without_default_derive, clippy::missing_docs_in_private_items, clippy::needless_pass_by_value,
clippy::default_trait_access, clippy::use_self)]
clippy::default_trait_access, clippy::use_self, clippy::useless_format)]
use std::collections::BTreeMap;
use std::collections::HashMap;
@ -403,6 +403,9 @@ fn expect_fun_call() {
//Issue #2979 - this should not lint
let msg = "bar";
Some("foo").expect(msg);
Some("foo").expect({ &format!("error") });
Some("foo").expect(format!("error").as_ref());
}
/// Checks implementation of `ITER_NTH` lint

66
tests/ui/methods.stderr
View file

@ -361,7 +361,7 @@ error: use of `expect` followed by a function call
--> $DIR/methods.rs:379:26
|
379 | with_none_and_as_str.expect(format!("Error {}: fake error", error_code).as_str());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| panic!(format!("Error {}: fake error", error_code).as_str()))`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| panic!("Error {}: fake error", error_code))`
error: use of `expect` followed by a function call
--> $DIR/methods.rs:389:25
@ -373,85 +373,97 @@ error: use of `expect` followed by a function call
--> $DIR/methods.rs:392:25
|
392 | with_err_and_as_str.expect(format!("Error {}: fake error", error_code).as_str());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| panic!(format!("Error {}: fake error", error_code).as_str()))`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| panic!("Error {}: fake error", error_code))`
error: use of `expect` followed by a function call
--> $DIR/methods.rs:407:17
|
407 | Some("foo").expect({ &format!("error") });
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| { let msg = { &format!("error") }; panic!(msg) }))`
error: use of `expect` followed by a function call
--> $DIR/methods.rs:408:17
|
408 | Some("foo").expect(format!("error").as_ref());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| panic!("error"))`
error: called `.iter().nth()` on a Vec. Calling `.get()` is both faster and more readable
--> $DIR/methods.rs:416:23
--> $DIR/methods.rs:419:23
|
416 | let bad_vec = some_vec.iter().nth(3);
419 | let bad_vec = some_vec.iter().nth(3);
| ^^^^^^^^^^^^^^^^^^^^^^
|
= note: `-D clippy::iter-nth` implied by `-D warnings`
error: called `.iter().nth()` on a slice. Calling `.get()` is both faster and more readable
--> $DIR/methods.rs:417:26
--> $DIR/methods.rs:420:26
|
417 | let bad_slice = &some_vec[..].iter().nth(3);
420 | let bad_slice = &some_vec[..].iter().nth(3);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
error: called `.iter().nth()` on a slice. Calling `.get()` is both faster and more readable
--> $DIR/methods.rs:418:31
--> $DIR/methods.rs:421:31
|
418 | let bad_boxed_slice = boxed_slice.iter().nth(3);
421 | let bad_boxed_slice = boxed_slice.iter().nth(3);
| ^^^^^^^^^^^^^^^^^^^^^^^^^
error: called `.iter().nth()` on a VecDeque. Calling `.get()` is both faster and more readable
--> $DIR/methods.rs:419:29
--> $DIR/methods.rs:422:29
|
419 | let bad_vec_deque = some_vec_deque.iter().nth(3);
422 | let bad_vec_deque = some_vec_deque.iter().nth(3);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: called `.iter_mut().nth()` on a Vec. Calling `.get_mut()` is both faster and more readable
--> $DIR/methods.rs:424:23
--> $DIR/methods.rs:427:23
|
424 | let bad_vec = some_vec.iter_mut().nth(3);
427 | let bad_vec = some_vec.iter_mut().nth(3);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
error: called `.iter_mut().nth()` on a slice. Calling `.get_mut()` is both faster and more readable
--> $DIR/methods.rs:427:26
--> $DIR/methods.rs:430:26
|
427 | let bad_slice = &some_vec[..].iter_mut().nth(3);
430 | let bad_slice = &some_vec[..].iter_mut().nth(3);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: called `.iter_mut().nth()` on a VecDeque. Calling `.get_mut()` is both faster and more readable
--> $DIR/methods.rs:430:29
--> $DIR/methods.rs:433:29
|
430 | let bad_vec_deque = some_vec_deque.iter_mut().nth(3);
433 | let bad_vec_deque = some_vec_deque.iter_mut().nth(3);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
--> $DIR/methods.rs:442:13
--> $DIR/methods.rs:445:13
|
442 | let _ = some_vec.iter().skip(42).next();
445 | let _ = some_vec.iter().skip(42).next();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `-D clippy::iter-skip-next` implied by `-D warnings`
error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
--> $DIR/methods.rs:443:13
--> $DIR/methods.rs:446:13
|
443 | let _ = some_vec.iter().cycle().skip(42).next();
446 | let _ = some_vec.iter().cycle().skip(42).next();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
--> $DIR/methods.rs:444:13
--> $DIR/methods.rs:447:13
|
444 | let _ = (1..10).skip(10).next();
447 | let _ = (1..10).skip(10).next();
| ^^^^^^^^^^^^^^^^^^^^^^^
error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
--> $DIR/methods.rs:445:14
--> $DIR/methods.rs:448:14
|
445 | let _ = &some_vec[..].iter().skip(3).next();
448 | let _ = &some_vec[..].iter().skip(3).next();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: used unwrap() on an Option value. If you don't want to handle the None case gracefully, consider using expect() to provide a better panic message
--> $DIR/methods.rs:454:13
--> $DIR/methods.rs:457:13
|
454 | let _ = opt.unwrap();
457 | let _ = opt.unwrap();
| ^^^^^^^^^^^^
|
= note: `-D clippy::option-unwrap-used` implied by `-D warnings`
error: aborting due to 56 previous errors
error: aborting due to 58 previous errors