Fixed truncated path not being normalized.

src/test/ui/issues/issue-22638.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// normalize-stderr-test: "<\[closure@.+`" -> "$$CLOSURE`"
+
 #![allow(unused)]
 
 #![recursion_limit = "20"]

src/test/ui/issues/issue-22638.stderr

@@ -1,5 +1,5 @@
-error: reached the type-length limit while instantiating `D::matches::<[closure@/home/david/projects/rust/workdirs/rust1/s...`
-  --> $DIR/issue-22638.rs:60:5
+error: reached the type-length limit while instantiating `D::matches::$CLOSURE`
+  --> $DIR/issue-22638.rs:62:5
    |
 LL | /     pub fn matches<F: Fn()>(&self, f: &F) {
 LL | |         //~^ ERROR reached the type-length limit while instantiating `D::matches::<[closure