Merge pull request #163 from jtbandes/master

Fix crash when considering invalid binary operator function for resolution.

<rdar://23719809&23720006>

Author: cwillmor

lib/Sema/CSGen.cpp

@@ -752,7 +752,10 @@ namespace {
       }
 
       Type paramTy = fnTy->getInput();
-      auto paramTupleTy = paramTy->castTo<TupleType>();
+      auto paramTupleTy = paramTy->getAs<TupleType>();
+      if (!paramTupleTy || paramTupleTy->getNumElements() != 2)
+        return false;
+      
       auto firstParamTy = paramTupleTy->getElement(0).getType();
       auto secondParamTy = paramTupleTy->getElement(1).getType();
 

validation-test/compiler_crashers_2_fixed/0036-rdar23719809.swift

@@ -0,0 +1,12 @@
+// RUN: not %target-swift-frontend %s -parse
+
+// rdar://problem/23719809&23720006
+
+func ~=() {}
+func ~=(_: Int) {}
+func ~=(_: () -> ()) {}
+
+switch 0 {
+case 0:
+    break
+}