print argument name in arg mismatch if possible

src/test/ui/argument-suggestions/basic.stderr

@@ -94,8 +94,8 @@ LL |     let closure = |x| x;
    |                   ^^^
 help: provide the argument
    |
-LL |     closure(/* value */);
-   |            ~~~~~~~~~~~~~
+LL |     closure(/* x */);
+   |            ~~~~~~~~~
 
 error: aborting due to 6 previous errors
 

src/test/ui/error-codes/E0057.stderr

@@ -11,8 +11,8 @@ LL |     let f = |x| x * 3;
    |             ^^^
 help: provide the argument
    |
-LL |     let a = f(/* value */);
-   |              ~~~~~~~~~~~~~
+LL |     let a = f(/* x */);
+   |              ~~~~~~~~~
 
 error[E0057]: this function takes 1 argument but 2 arguments were supplied
   --> $DIR/E0057.rs:5:13

src/test/ui/higher-rank-trait-bounds/issue-58451.stderr

@@ -11,8 +11,8 @@ LL | fn f<I>(i: I)
    |    ^    ----
 help: provide the argument
    |
-LL |     f(&[f(/* value */)]);
-   |          ~~~~~~~~~~~~~
+LL |     f(&[f(/* i */)]);
+   |          ~~~~~~~~~
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-3044.stderr

@@ -13,7 +13,7 @@ help: provide the argument
    |
 LL ~     needlesArr.iter().fold(|x, y| {
 LL +
-LL ~     }, /* value */);
+LL ~     }, /* f */);
    |
 
 error: aborting due to previous error