Add test enum-lack-comma-suggestion-issue-142311.rs

Signed-off-by: xizheyin <[email protected]>

Author: xizheyin

tests/ui/enum/enum-lack-comma-suggestion-issue-142311.rs

@@ -0,0 +1,9 @@
+enum Foo {
+    /// Like the noise a sheep makes
+    Bar
+    /// Like where people drink
+    //~^ ERROR expected one of `(`, `,`, `=`, `{`, or `}`, found doc comment `/// Like where people drink`
+    Baa
+}
+
+fn main() {}

tests/ui/enum/enum-lack-comma-suggestion-issue-142311.stderr

@@ -0,0 +1,19 @@
+error: expected one of `(`, `,`, `=`, `{`, or `}`, found doc comment `/// Like where people drink`
+  --> $DIR/enum-lack-comma-suggestion-issue-142311.rs:4:5
+   |
+LL |     Bar
+   |        - expected one of `(`, `,`, `=`, `{`, or `}`
+LL |     /// Like where people drink
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ unexpected token
+   |
+help: add a space before the last `/` to write a regular comment
+   |
+LL |     // / Like where people drink
+   |       +
+help: missing `,`
+   |
+LL |     Bar,
+   |        +
+
+error: aborting due to 1 previous error
+