Add parser test

src/test/ui/track-diagnostics/track5.rs

@@ -0,0 +1,8 @@
+// compile-flags: -Z track-diagnostics
+// error-pattern: created at
+
+// Normalize the emitted location so this doesn't need
+// updating everytime someone adds or removes a line.
+// normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
+
+}

src/test/ui/track-diagnostics/track5.stderr

@@ -0,0 +1,9 @@
+error: unexpected closing delimiter: `}`
+  --> $DIR/track5.rs:LL:CC
+   |
+LL | }
+   | ^ unexpected closing delimiter
+-Ztrack-diagnostics: created at compiler/rustc_parse/src/lexer/tokentrees.rs:LL:CC
+
+error: aborting due to previous error
+