Rollup merge of #59079 - euclio:macro-semi, r=estebank

add suggestions to invalid macro item error

r? @estebank

src/test/ui/issues/issue-10536.rs

@@ -12,7 +12,7 @@ pub fn main() {
     foo!();
 
     assert!({one! two()});
-    //~^ ERROR macros that expand to items must either be surrounded with braces or followed by a
+    //~^ ERROR macros that expand to items
     //~| ERROR cannot find macro `one!` in this scope
     //~| ERROR mismatched types
 

src/test/ui/issues/issue-10536.stderr

@@ -1,8 +1,16 @@
-error: macros that expand to items must either be surrounded with braces or followed by a semicolon
+error: macros that expand to items must be delimited with braces or followed by a semicolon
   --> $DIR/issue-10536.rs:14:22
    |
 LL |     assert!({one! two()});
    |                      ^^
+help: change the delimiters to curly braces
+   |
+LL |     assert!({one! two {}});
+   |                       ^^
+help: add a semicolon
+   |
+LL |     assert!({one! two();});
+   |                        ^
 
 error: expected `(` or `{`, found `}`
   --> $DIR/issue-10536.rs:21:22

src/test/ui/parser/macros-no-semicolon-items.rs

@@ -1,4 +1,15 @@
 macro_rules! foo()  //~ ERROR semicolon
+                    //~| ERROR unexpected end of macro
+
+macro_rules! bar {
+    ($($tokens:tt)*) => {}
+}
+
+bar!( //~ ERROR semicolon
+    blah
+    blah
+    blah
+)
 
 fn main() {
 }

src/test/ui/parser/macros-no-semicolon-items.stderr

@@ -1,8 +1,45 @@
-error: macros that expand to items must either be surrounded with braces or followed by a semicolon
+error: macros that expand to items must be delimited with braces or followed by a semicolon
   --> $DIR/macros-no-semicolon-items.rs:1:17
    |
 LL | macro_rules! foo()
    |                 ^^
+help: change the delimiters to curly braces
+   |
+LL | macro_rules! foo {}
+   |                  ^^
+help: add a semicolon
+   |
+LL | macro_rules! foo();
+   |                   ^
 
-error: aborting due to previous error
+error: macros that expand to items must be delimited with braces or followed by a semicolon
+  --> $DIR/macros-no-semicolon-items.rs:8:5
+   |
+LL |   bar!(
+   |  _____^
+LL | |     blah
+LL | |     blah
+LL | |     blah
+LL | | )
+   | |_^
+help: change the delimiters to curly braces
+   |
+LL | bar! {
+LL |     blah
+LL |     blah
+LL |     blah
+LL | }
+   |
+help: add a semicolon
+   |
+LL | );
+   |  ^
+
+error: unexpected end of macro invocation
+  --> $DIR/macros-no-semicolon-items.rs:1:1
+   |
+LL | macro_rules! foo()
+   | ^^^^^^^^^^^^^^^^^^ missing tokens in macro arguments
+
+error: aborting due to 3 previous errors