Regression test for improper spans in inclusive-range suggestions

tests/ui/parser/range-inclusive-suggestion-span.rs

@@ -0,0 +1,14 @@
+#![crate_type = "rlib"]
+
+// Suggestions for range patterns should not perform span manipulations that
+// assume the range token is ASCII, because it could have been recovered from
+// similar-looking Unicode characters.
+//
+// Regression test for <https://github.com/rust-lang/rust/issues/155799>.
+
+// FIXME: The ICE is fixed in a subsequent commit.
+//@ known-bug: #155799
+//@ failure-status: 101
+
+// These dots are U+00B7 MIDDLE DOT, not an ASCII period.
+fn dot_dot_dot() { ··· }