Rollup merge of #134154 - dev-ardi:field-expr-generics, r=compiler-errors

suppress field expr with generics error message if it's a method

Don't emit "field expressions may not have generic arguments" if it's a method call without `()`

r? estebank
Fixes #67680

Is this the best way to go? It's by far the simplest I could come up with.

compiler/rustc_errors/src/lib.rs

@@ -576,6 +576,10 @@ pub enum StashKey {
     UndeterminedMacroResolution,
     /// Used by `Parser::maybe_recover_trailing_expr`
     ExprInPat,
+    /// If in the parser we detect a field expr with turbofish generic params it's possible that
+    /// it's a method call without parens. If later on in `hir_typeck` we find out that this is
+    /// the case we suppress this message and we give a better suggestion.
+    GenericInFieldExpr,
 }
 
 fn default_track_diagnostic<R>(diag: DiagInner, f: &mut dyn FnMut(DiagInner) -> R) -> R {