do not suggest a semicolon for a macro without `!`

compiler/rustc_parse/src/parser/expr.rs

@@ -1977,6 +1977,9 @@ impl<'a> Parser<'a> {
         open_delim_span: Span,
     ) -> PResult<'a, ()> {
         if self.token.kind == token::Comma {
+            if !self.sess.source_map().is_multiline(prev_span.until(self.token.span)) {
+                return Ok(());
+            }
             let mut snapshot = self.create_snapshot_for_diagnostic();
             snapshot.bump();
             match snapshot.parse_seq_to_before_end(

src/test/ui/parser/do-not-suggest-semicolon-before-array.stderr

@@ -1,5 +1,5 @@
 error: expected one of `.`, `?`, `]`, or an operator, found `,`
-  --> $DIR/do-not-suggest-suggest-semicolon-before-array.rs:5:5
+  --> $DIR/do-not-suggest-semicolon-before-array.rs:5:5
    |
 LL |     [1, 3)
    |     ^ ^ help: `]` may belong here

src/test/ui/parser/do-not-suggest-semicolon-between-macro-without-exclamation-mark-and-array.rs

@@ -0,0 +1,3 @@
+fn main() {
+    let _x = vec[1, 2, 3]; //~ ERROR expected one of `.`, `?`, `]`, or an operator
+}

src/test/ui/parser/do-not-suggest-semicolon-between-macro-without-exclamation-mark-and-array.stderr

@@ -0,0 +1,8 @@
+error: expected one of `.`, `?`, `]`, or an operator, found `,`
+  --> $DIR/do-not-suggest-semicolon-between-macro-without-exclamation-mark-and-array.rs:2:19
+   |
+LL |     let _x = vec[1, 2, 3];
+   |                   ^ expected one of `.`, `?`, `]`, or an operator
+
+error: aborting due to previous error
+

src/test/ui/parser/suggest-semicolon-before-array.stderr

@@ -1,5 +1,5 @@
 error: expected `;`, found `[`
-  --> $DIR/suggest-suggest-semicolon-before-array.rs:8:5
+  --> $DIR/suggest-semicolon-before-array.rs:8:5
    |
 LL |     [1, 3]
    |     ^