Fix ICE #90993: add missing call to cancel

compiler/rustc_parse/src/parser/pat.rs

@@ -817,7 +817,7 @@ impl<'a> Parser<'a> {
             // Ensure the user doesn't receive unhelpful unexpected token errors
             self.bump();
             if self.is_pat_range_end_start(0) {
-                let _ = self.parse_pat_range_end();
+                let _ = self.parse_pat_range_end().map_err(|mut e| e.cancel());
             }
 
             self.error_inclusive_range_with_extra_equals(span_with_eq);

src/test/ui/parser/issue-90993.rs

@@ -0,0 +1,6 @@
+fn main() {
+    ...=.
+    //~^ ERROR: unexpected token: `...`
+    //~| ERROR: unexpected `=` after inclusive range
+    //~| ERROR: expected one of `-`, `;`, `}`, or path, found `.`
+}

src/test/ui/parser/issue-90993.stderr

@@ -0,0 +1,31 @@
+error: unexpected token: `...`
+  --> $DIR/issue-90993.rs:2:5
+   |
+LL |     ...=.
+   |     ^^^
+   |
+help: use `..` for an exclusive range
+   |
+LL |     ..=.
+   |     ~~
+help: or `..=` for an inclusive range
+   |
+LL |     ..==.
+   |     ~~~
+
+error: unexpected `=` after inclusive range
+  --> $DIR/issue-90993.rs:2:5
+   |
+LL |     ...=.
+   |     ^^^^ help: use `..=` instead
+   |
+   = note: inclusive ranges end with a single equals sign (`..=`)
+
+error: expected one of `-`, `;`, `}`, or path, found `.`
+  --> $DIR/issue-90993.rs:2:9
+   |
+LL |     ...=.
+   |         ^ expected one of `-`, `;`, `}`, or path
+
+error: aborting due to 3 previous errors
+