Trigger missing comma rustc suggestion

dtolnay · dtolnay · commit 9357569b1c56 · 2020-06-28T22:46:33.000-07:00
diff --git a/src/macros.rs b/src/macros.rs
@@ -299,5 +299,5 @@ macro_rules! json_unexpected {
 #[macro_export]
 #[doc(hidden)]
 macro_rules! json_expect_expr_comma {
-    ($e:expr ,) => {};
+    ($e:expr , $($tt:tt)*) => {};
 }
diff --git a/tests/ui/missing_comma.stderr b/tests/ui/missing_comma.stderr
@@ -2,4 +2,6 @@ error: no rules expected the token `"2"`
  --> $DIR/missing_comma.rs:4:21
   |
 4 |     json!({ "1": "" "2": "" });
-  |                     ^^^ no rules expected this token in macro call
+  |                    -^^^ no rules expected this token in macro call
+  |                    |
+  |                    help: missing comma here

Original file line number	Diff line number	Diff line change
`@@ -299,5 +299,5 @@ macro_rules! json_unexpected {`
`299`	`299`	`#[macro_export]`
`300`	`300`	`#[doc(hidden)]`
`301`	`301`	`macro_rules! json_expect_expr_comma {`
`302`		`- ($e:expr ,) => {};`
	`302`	`+ ($e:expr , $($tt:tt)*) => {};`
`303`	`303`	`}`
Original file line number	Diff line number	Diff line change
@@ -2,4 +2,6 @@ error: no rules expected the token `"2"`
`2`	`2`	`--> $DIR/missing_comma.rs:4:21`
`3`	`3`	`\|`
`4`	`4`	`4 \| json!({ "1": "" "2": "" });`
`5`		`- \| ^^^ no rules expected this token in macro call`
	`5`	`+ \| -^^^ no rules expected this token in macro call`
	`6`	`+ \| \|`
	`7`	`+ \| help: missing comma here`