diff options
Diffstat (limited to 'src/tools/clippy/clippy_lints/src/casts/as_underscore.rs')
-rw-r--r-- | src/tools/clippy/clippy_lints/src/casts/as_underscore.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/tools/clippy/clippy_lints/src/casts/as_underscore.rs b/src/tools/clippy/clippy_lints/src/casts/as_underscore.rs new file mode 100644 index 000000000..56e894c62 --- /dev/null +++ b/src/tools/clippy/clippy_lints/src/casts/as_underscore.rs @@ -0,0 +1,25 @@ +use clippy_utils::diagnostics::span_lint_and_then; +use rustc_errors::Applicability; +use rustc_hir::{Expr, Ty, TyKind}; +use rustc_lint::LateContext; +use rustc_middle::ty; + +use super::AS_UNDERSCORE; + +pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, ty: &'tcx Ty<'_>) { + if matches!(ty.kind, TyKind::Infer) { + span_lint_and_then(cx, AS_UNDERSCORE, expr.span, "using `as _` conversion", |diag| { + let ty_resolved = cx.typeck_results().expr_ty(expr); + if let ty::Error(_) = ty_resolved.kind() { + diag.help("consider giving the type explicitly"); + } else { + diag.span_suggestion( + ty.span, + "consider giving the type explicitly", + ty_resolved, + Applicability::MachineApplicable, + ); + } + }); + } +} |