diff options
| -rw-r--r-- | clippy_lints/src/extra_unused_type_parameters.rs | 7 | ||||
| -rw-r--r-- | tests/ui/extra_unused_type_parameters.rs | 2 | ||||
| -rw-r--r-- | tests/ui/extra_unused_type_parameters.stderr | 10 |
3 files changed, 14 insertions, 5 deletions
diff --git a/clippy_lints/src/extra_unused_type_parameters.rs b/clippy_lints/src/extra_unused_type_parameters.rs index 9e9ad80b334..040473c9ffc 100644 --- a/clippy_lints/src/extra_unused_type_parameters.rs +++ b/clippy_lints/src/extra_unused_type_parameters.rs @@ -23,7 +23,6 @@ declare_clippy_lint! { /// /// ### Example /// ```rust - /// // unused type parameters /// fn unused_ty<T>(x: u8) { /// // .. /// } @@ -45,7 +44,7 @@ declare_lint_pass!(ExtraUnusedTypeParameters => [EXTRA_UNUSED_TYPE_PARAMETERS]); /// trait bounds those parameters have. struct TypeWalker<'cx, 'tcx> { cx: &'cx LateContext<'tcx>, - /// Collection of all the type parameters and their spans. + /// Collection of all the function's type parameters. ty_params: FxHashMap<DefId, Span>, /// Collection of any (inline) trait bounds corresponding to each type parameter. bounds: FxHashMap<DefId, Span>, @@ -69,8 +68,8 @@ impl<'cx, 'tcx> TypeWalker<'cx, 'tcx> { .params .iter() .filter_map(|param| { - if let GenericParamKind::Type { .. } = param.kind { - Some((param.def_id.into(), param.span)) + if let GenericParamKind::Type { synthetic, .. } = param.kind { + (!synthetic).then_some((param.def_id.into(), param.span)) } else { if !param.is_elided_lifetime() { all_params_unused = false; diff --git a/tests/ui/extra_unused_type_parameters.rs b/tests/ui/extra_unused_type_parameters.rs index a1cd8a0d085..2894fda2f47 100644 --- a/tests/ui/extra_unused_type_parameters.rs +++ b/tests/ui/extra_unused_type_parameters.rs @@ -71,6 +71,8 @@ where .filter_map(move |(i, a)| if i == index { None } else { Some(a) }) } +fn unused_opaque<A, B>(dummy: impl Default) {} + mod issue10319 { fn assert_send<T: Send>() {} diff --git a/tests/ui/extra_unused_type_parameters.stderr b/tests/ui/extra_unused_type_parameters.stderr index 69a067bd849..aea3ee310f7 100644 --- a/tests/ui/extra_unused_type_parameters.stderr +++ b/tests/ui/extra_unused_type_parameters.stderr @@ -55,5 +55,13 @@ LL | fn unused_ty_impl<T>(&self) {} | = help: consider removing the parameter -error: aborting due to 7 previous errors +error: type parameters go unused in function definition + --> $DIR/extra_unused_type_parameters.rs:74:17 + | +LL | fn unused_opaque<A, B>(dummy: impl Default) {} + | ^^^^^^ + | + = help: consider removing the parameters + +error: aborting due to 8 previous errors |