jdonszelmann feedback

Author: hkBst

compiler/rustc_error_codes/src/error_codes/E0608.md

@@ -17,5 +17,9 @@ let v: Vec<u8> = vec![0, 1, 2, 3];
 println!("{}", v[2]);
 ```
 
-Tuples and structs are indexed with dot (`._`), not with brackets (`[_]`).
-Tuple element names are their positions: tuple = (tuple.0, tuple.1, ...)
+Tuples and structs are indexed with dot (`.`), not with brackets (`[]`),
+and tuple element names are their positions:
+```ignore(pseudo code)
+// this (pseudo code) expression is true for any tuple:
+tuple == (tuple.0, tuple.1, ...)
+```

compiler/rustc_hir_typeck/src/expr.rs

@@ -3553,7 +3553,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     // Try to give some advice about indexing tuples.
                     if let ty::Tuple(types) = base_t.kind() {
                         err.help(
-                            "tuples are indexed with dot (`._`): tuple = (tuple.0, tuple.1, ...)",
+                            "tuples are indexed with dot: `tuple == (tuple.0, tuple.1, ...)`",
                         );
                         // If index is an unsuffixed integer, show the fixed expression:
                         if let ExprKind::Lit(lit) = idx.kind