Rollup merge of #112643 - compiler-errors:sized-obl-for-arg, r=wesleywiser

Always register sized obligation for argument

Removes a "hack" that skips registering sized obligations for parameters that are simple identifiers. This doesn't seem to affect diagnostics because we're probably already being smart enough about deduplicating identical error messages anyways.

Fixes #112608

compiler/rustc_hir_typeck/src/check.rs

@@ -92,10 +92,7 @@ pub(super) fn check_fn<'a, 'tcx>(
         fcx.check_pat_top(&param.pat, param_ty, ty_span, None);
 
         // Check that argument is Sized.
-        // The check for a non-trivial pattern is a hack to avoid duplicate warnings
-        // for simple cases like `fn foo(x: Trait)`,
-        // where we would error once on the parameter as a whole, and once on the binding `x`.
-        if param.pat.simple_ident().is_none() && !params_can_be_unsized {
+        if !params_can_be_unsized {
             fcx.require_type_is_sized(
                 param_ty,
                 param.pat.span,