[SILGen] add a crasher in Type Lowering

dduan · dduan · commit f2e3d0be23a4 · 2016-02-17T22:40:02.000-08:00
diff --git a/validation-test/compiler_crashers_2/0038-lowering-CheckedCastEmitter-emitConditional.swift b/validation-test/compiler_crashers_2/0038-lowering-CheckedCastEmitter-emitConditional.swift
@@ -0,0 +1,4 @@
+// RUN: not --crash %target-swift-frontend %s -emit-silgen
+
+let a: () -> Int? = { return nil }
+a as? Int
