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Merge pull request #2975 from aaudiber/lint-identity-into-iter

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Lint using identity into_iter conversion
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Philipp Hansch 2018-08-05 20:38:28 +01:00 • committed by GitHub
commit 32e4897854
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3 changed files with 34 additions and 9 deletions
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14
clippy_lints/src/identity_conversion.rs
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@ -5,7 +5,7 @@ use syntax::ast::NodeId;
use crate::utils::{in_macro, match_def_path, match_trait_method, same_tys, snippet, span_lint_and_then};
use crate::utils::{opt_def_id, paths, resolve_node};
/// **What it does:** Checks for always-identical `Into`/`From` conversions.
/// **What it does:** Checks for always-identical `Into`/`From`/`IntoIter` conversions.
///
/// **Why is this bad?** Redundant code.
///
@ -19,7 +19,7 @@ use crate::utils::{opt_def_id, paths, resolve_node};
declare_clippy_lint! {
pub IDENTITY_CONVERSION,
complexity,
"using always-identical `Into`/`From` conversions"
"using always-identical `Into`/`From`/`IntoIter` conversions"
}
#[derive(Default)]
@ -67,6 +67,16 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion {
});
}
}
if match_trait_method(cx, e, &paths::INTO_ITERATOR) && &*name.ident.as_str() == "into_iter" {
let a = cx.tables.expr_ty(e);
let b = cx.tables.expr_ty(&args[0]);
if same_tys(cx, a, b) {
let sugg = snippet(cx, args[0].span, "<expr>").into_owned();
span_lint_and_then(cx, IDENTITY_CONVERSION, e.span, "identical conversion", |db| {
db.span_suggestion(e.span, "consider removing `.into_iter()`", sugg);
});
}
}
},
ExprKind::Call(ref path, ref args) => if let ExprKind::Path(ref qpath) = path.node {