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Merge pull request #2507 from ordovicia/redundant_field_names_range
Don't lint range syntax with var name `start` and/or `end`
This commit is contained in:
commit
05f92b84c9
4 changed files with 86 additions and 7 deletions
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@ -1,6 +1,6 @@
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use rustc::lint::*;
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use rustc::hir::*;
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use utils::{span_lint_and_sugg, match_var};
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use utils::{is_range_expression, match_var, span_lint_and_sugg};
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/// **What it does:** Checks for fields in struct literals where shorthands
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/// could be used.
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@ -36,10 +36,17 @@ impl LintPass for RedundantFieldNames {
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impl<'a, 'tcx> LateLintPass<'a, 'tcx> for RedundantFieldNames {
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fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
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if let ExprStruct(_, ref fields, _) = expr.node {
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if let ExprStruct(ref path, ref fields, _) = expr.node {
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for field in fields {
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let name = field.name.node;
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// Do not care about range expressions.
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// They could have redundant field name when desugared to structs.
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// e.g. `start..end` is desugared to `Range { start: start, end: end }`
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if is_range_expression(expr.span) {
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continue;
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}
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if match_var(&field.expr, name) && !field.is_shorthand {
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span_lint_and_sugg (
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cx,
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@ -64,6 +64,16 @@ pub fn in_macro(span: Span) -> bool {
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})
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}
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/// Returns true if `expn_info` was expanded by range expressions.
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pub fn is_range_expression(span: Span) -> bool {
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span.ctxt().outer().expn_info().map_or(false, |info| {
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match info.callee.format {
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ExpnFormat::CompilerDesugaring(CompilerDesugaringKind::DotFill) => true,
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_ => false,
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}
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})
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}
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/// Returns true if the macro that expanded the crate was outside of the
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/// current crate or was a
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/// compiler plugin.
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@ -1,5 +1,8 @@
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#![warn(redundant_field_names)]
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#![allow(unused_variables)]
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#![feature(inclusive_range, inclusive_range_syntax)]
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use std::ops::{Range, RangeFrom, RangeTo, RangeInclusive, RangeToInclusive};
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mod foo {
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pub const BAR: u8 = 0;
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@ -27,4 +30,21 @@ fn main() {
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buzz: fizz, //should be ok
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foo: foo::BAR, //should be ok
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};
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// Range expressions
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let (start, end) = (0, 0);
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let _ = start..;
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let _ = ..end;
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let _ = start..end;
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let _ = ..=end;
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let _ = start..=end;
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// hand-written Range family structs are linted
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let _ = RangeFrom { start: start };
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let _ = RangeTo { end: end };
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let _ = Range { start: start, end: end };
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let _ = RangeInclusive { start: start, end: end };
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let _ = RangeToInclusive { end: end };
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}
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@ -1,16 +1,58 @@
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:23:9
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--> $DIR/redundant_field_names.rs:26:9
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23 | gender: gender,
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26 | gender: gender,
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| ^^^^^^^^^^^^^^ help: replace it with: `gender`
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= note: `-D redundant-field-names` implied by `-D warnings`
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:24:9
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--> $DIR/redundant_field_names.rs:27:9
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24 | age: age,
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27 | age: age,
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| ^^^^^^^^ help: replace it with: `age`
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error: aborting due to 2 previous errors
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:45:25
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45 | let _ = RangeFrom { start: start };
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| ^^^^^^^^^^^^ help: replace it with: `start`
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:46:23
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46 | let _ = RangeTo { end: end };
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| ^^^^^^^^ help: replace it with: `end`
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:47:21
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47 | let _ = Range { start: start, end: end };
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| ^^^^^^^^^^^^ help: replace it with: `start`
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:47:35
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47 | let _ = Range { start: start, end: end };
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| ^^^^^^^^ help: replace it with: `end`
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:48:30
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48 | let _ = RangeInclusive { start: start, end: end };
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| ^^^^^^^^^^^^ help: replace it with: `start`
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:48:44
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48 | let _ = RangeInclusive { start: start, end: end };
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| ^^^^^^^^ help: replace it with: `end`
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error: redundant field names in struct initialization
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--> $DIR/redundant_field_names.rs:49:32
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49 | let _ = RangeToInclusive { end: end };
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| ^^^^^^^^ help: replace it with: `end`
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error: aborting due to 9 previous errors
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