test: unresolved lifetime segfault

gcc/testsuite/ChangeLog:

	* rust/compile/invalid-lifetime-in-generic-arg.rs: New test.

Signed-off-by: vibhatsu <maulikbarot2915@gmail.com>

Author: v1bh475u

gcc/testsuite/rust/compile/invalid-lifetime-in-generic-arg.rs

@@ -0,0 +1,14 @@
+#![feature(no_core)]
+#![no_core]
+
+// Test for segfault when processing enum variant with reference to type
+// with unresolved lifetime in generic arguments.
+// The compiler should report an error gracefully instead of crashing.
+
+enum ast<'a> {
+    num(usize),
+    add(&'a ast<'result>) // { dg-error "failed to resolve type path segment" }
+    // { dg-error "unresolved lifetime" "" { target *-*-* } .-1 }
+}
+
+pub fn main() {}