Auto merge of #127419 - trevyn:issue-125446, r=fee1-dead

Add suggestions for possible missing `fn`, `struct`, or `enum` keywords

Closes #125446
Closes #65381

tests/ui/parser/extern-no-fn.rs

@@ -1,5 +1,7 @@
 extern "C" {
-    f(); //~ ERROR expected one of `!` or `::`, found `(`
+    f();
+    //~^ ERROR missing `fn` or `struct` for function or struct definition
+    //~| HELP if you meant to call a macro, try
 }
 
 fn main() {

tests/ui/parser/extern-no-fn.stderr

@@ -1,12 +1,18 @@
-error: expected one of `!` or `::`, found `(`
-  --> $DIR/extern-no-fn.rs:2:6
+error: missing `fn` or `struct` for function or struct definition
+  --> $DIR/extern-no-fn.rs:2:5
    |
 LL | extern "C" {
    |            - while parsing this item list starting here
 LL |     f();
-   |      ^ expected one of `!` or `::`
+   |     ^
+...
 LL | }
    | - the item list ends here
+   |
+help: if you meant to call a macro, try
+   |
+LL |     f!();
+   |     ~~
 
 error: aborting due to 1 previous error
 

tests/ui/parser/missing-enum-issue-125446.rs

@@ -0,0 +1,6 @@
+Whoops {
+//~^ ERROR missing `enum` for enum definition
+//~| HELP add `enum` here to parse `Whoops` as an enum
+    OptionA,
+    OptionB,
+}

tests/ui/parser/missing-enum-issue-125446.stderr

@@ -0,0 +1,13 @@
+error: missing `enum` for enum definition
+  --> $DIR/missing-enum-issue-125446.rs:1:1
+   |
+LL | Whoops {
+   | ^^^^^^
+   |
+help: add `enum` here to parse `Whoops` as an enum
+   |
+LL | enum Whoops {
+   | ++++
+
+error: aborting due to 1 previous error
+

tests/ui/parser/missing-enum-or-struct-issue-125446.rs

@@ -0,0 +1,2 @@
+Whoops {}
+//~^ ERROR missing `enum` or `struct` for enum or struct definition

tests/ui/parser/missing-enum-or-struct-issue-125446.stderr

@@ -0,0 +1,8 @@
+error: missing `enum` or `struct` for enum or struct definition
+  --> $DIR/missing-enum-or-struct-issue-125446.rs:1:1
+   |
+LL | Whoops {}
+   | ^^^^^^
+
+error: aborting due to 1 previous error
+

tests/ui/parser/missing-fn-issue-125446.rs

@@ -0,0 +1,7 @@
+whoops() {}
+//~^ ERROR missing `fn` for function definition
+//~| HELP add `fn` here to parse `whoops` as a function
+
+fn main() {
+    whoops();
+}

tests/ui/parser/missing-fn-issue-125446.stderr

@@ -0,0 +1,13 @@
+error: missing `fn` for function definition
+  --> $DIR/missing-fn-issue-125446.rs:1:1
+   |
+LL | whoops() {}
+   | ^^^^^^
+   |
+help: add `fn` here to parse `whoops` as a function
+   |
+LL | fn whoops() {}
+   | ++
+
+error: aborting due to 1 previous error
+

tests/ui/parser/missing-fn-issue-65381-1.rs

@@ -0,0 +1,4 @@
+main() {
+//~^ ERROR missing `fn` for function definition
+//~| HELP add `fn` here to parse `main` as a function
+}

tests/ui/parser/missing-fn-issue-65381-1.stderr

@@ -0,0 +1,13 @@
+error: missing `fn` for function definition
+  --> $DIR/missing-fn-issue-65381-1.rs:1:1
+   |
+LL | main() {
+   | ^^^^
+   |
+help: add `fn` here to parse `main` as a function
+   |
+LL | fn main() {
+   | ++
+
+error: aborting due to 1 previous error
+

tests/ui/parser/missing-fn-issue-65381-2.rs

@@ -0,0 +1,3 @@
+main();
+//~^ ERROR missing `fn` or `struct` for function or struct definition
+//~| HELP if you meant to call a macro, try

tests/ui/parser/missing-fn-issue-65381-2.stderr

@@ -0,0 +1,13 @@
+error: missing `fn` or `struct` for function or struct definition
+  --> $DIR/missing-fn-issue-65381-2.rs:1:1
+   |
+LL | main();
+   | ^^^^
+   |
+help: if you meant to call a macro, try
+   |
+LL | main!();
+   | ~~~~~
+
+error: aborting due to 1 previous error
+

tests/ui/parser/missing-fn-issue-65381-3.rs

@@ -0,0 +1,4 @@
+pub const initial_value() -> Self {
+//~^ ERROR missing `fn` for function definition
+//~| HELP add `fn` here to parse `initial_value` as a function
+}

tests/ui/parser/missing-fn-issue-65381-3.stderr

@@ -0,0 +1,13 @@
+error: missing `fn` for function definition
+  --> $DIR/missing-fn-issue-65381-3.rs:1:11
+   |
+LL | pub const initial_value() -> Self {
+   |           ^^^^^^^^^^^^^
+   |
+help: add `fn` here to parse `initial_value` as a function
+   |
+LL | pub const fn initial_value() -> Self {
+   |           ++
+
+error: aborting due to 1 previous error
+

tests/ui/parser/missing-struct-issue-125446.rs

@@ -0,0 +1,5 @@
+Whoops {
+//~^ ERROR missing `struct` for struct definition
+//~| HELP add `struct` here to parse `Whoops` as a struct
+    value: u64,
+}

tests/ui/parser/missing-struct-issue-125446.stderr

@@ -0,0 +1,13 @@
+error: missing `struct` for struct definition
+  --> $DIR/missing-struct-issue-125446.rs:1:1
+   |
+LL | Whoops {
+   | ^^^^^^
+   |
+help: add `struct` here to parse `Whoops` as a struct
+   |
+LL | struct Whoops {
+   | ++++++
+
+error: aborting due to 1 previous error
+