Rollup merge of #93061 - estebank:macr-suggestion, r=cjgillot

Only suggest adding `!` to expressions that can be macro invocation

src/test/ui/hygiene/rustc-macro-transparency.stderr

@@ -11,16 +11,10 @@ LL |     struct SemiTransparent;
    |     ----------------------- similarly named unit struct `SemiTransparent` defined here
 ...
 LL |     semitransparent;
-   |     ^^^^^^^^^^^^^^^ not a value
-   |
-help: use `!` to invoke the macro
-   |
-LL |     semitransparent!;
-   |                    +
-help: a unit struct with a similar name exists
-   |
-LL |     SemiTransparent;
-   |     ~~~~~~~~~~~~~~~
+   |     ^^^^^^^^^^^^^^^
+   |     |
+   |     not a value
+   |     help: a unit struct with a similar name exists: `SemiTransparent`
 
 error[E0423]: expected value, found macro `opaque`
   --> $DIR/rustc-macro-transparency.rs:30:5
@@ -29,16 +23,10 @@ LL |     struct Opaque;
    |     -------------- similarly named unit struct `Opaque` defined here
 ...
 LL |     opaque;
-   |     ^^^^^^ not a value
-   |
-help: use `!` to invoke the macro
-   |
-LL |     opaque!;
-   |           +
-help: a unit struct with a similar name exists
-   |
-LL |     Opaque;
-   |     ~~~~~~
+   |     ^^^^^^
+   |     |
+   |     not a value
+   |     help: a unit struct with a similar name exists (notice the capitalization): `Opaque`
 
 error: aborting due to 3 previous errors
 

src/test/ui/resolve/resolve-hint-macro.fixed

@@ -0,0 +1,11 @@
+// run-rustfix
+fn main() {
+    assert_eq!(1, 1);
+    //~^ ERROR expected function, found macro `assert_eq`
+    assert_eq! { 1, 1 };
+    //~^ ERROR expected struct, variant or union type, found macro `assert_eq`
+    //~| ERROR expected identifier, found `1`
+    //~| ERROR expected identifier, found `1`
+    assert![true];
+    //~^ ERROR expected value, found macro `assert`
+}

src/test/ui/resolve/resolve-hint-macro.rs

@@ -1,4 +1,11 @@
+// run-rustfix
 fn main() {
     assert_eq(1, 1);
     //~^ ERROR expected function, found macro `assert_eq`
+    assert_eq { 1, 1 };
+    //~^ ERROR expected struct, variant or union type, found macro `assert_eq`
+    //~| ERROR expected identifier, found `1`
+    //~| ERROR expected identifier, found `1`
+    assert[true];
+    //~^ ERROR expected value, found macro `assert`
 }

src/test/ui/resolve/resolve-hint-macro.stderr

@@ -1,5 +1,21 @@
+error: expected identifier, found `1`
+  --> $DIR/resolve-hint-macro.rs:5:17
+   |
+LL |     assert_eq { 1, 1 };
+   |     ---------   ^ expected identifier
+   |     |
+   |     while parsing this struct
+
+error: expected identifier, found `1`
+  --> $DIR/resolve-hint-macro.rs:5:20
+   |
+LL |     assert_eq { 1, 1 };
+   |     ---------      ^ expected identifier
+   |     |
+   |     while parsing this struct
+
 error[E0423]: expected function, found macro `assert_eq`
-  --> $DIR/resolve-hint-macro.rs:2:5
+  --> $DIR/resolve-hint-macro.rs:3:5
    |
 LL |     assert_eq(1, 1);
    |     ^^^^^^^^^ not a function
@@ -9,6 +25,29 @@ help: use `!` to invoke the macro
 LL |     assert_eq!(1, 1);
    |              +
 
-error: aborting due to previous error
+error[E0574]: expected struct, variant or union type, found macro `assert_eq`
+  --> $DIR/resolve-hint-macro.rs:5:5
+   |
+LL |     assert_eq { 1, 1 };
+   |     ^^^^^^^^^ not a struct, variant or union type
+   |
+help: use `!` to invoke the macro
+   |
+LL |     assert_eq! { 1, 1 };
+   |              +
 
-For more information about this error, try `rustc --explain E0423`.
+error[E0423]: expected value, found macro `assert`
+  --> $DIR/resolve-hint-macro.rs:9:5
+   |
+LL |     assert[true];
+   |     ^^^^^^ not a value
+   |
+help: use `!` to invoke the macro
+   |
+LL |     assert![true];
+   |           +
+
+error: aborting due to 5 previous errors
+
+Some errors have detailed explanations: E0423, E0574.
+For more information about an error, try `rustc --explain E0423`.