[test] Add test case for rdar://116956363

test/Constraints/rdar116956363.swift

@@ -0,0 +1,20 @@
+// RUN: %target-typecheck-verify-swift
+
+// rdar://116956363 - Make sure we don't crash here.
+@resultBuilder
+struct Builder {
+  static func buildBlock<T>(_ x: T) -> T { x }
+}
+
+func bar(_ fn: () -> Void) -> Int { 0 }
+
+@Builder
+func foo(_ b: Bool) -> Int {
+  bar {
+    let _ = if b {
+      1
+    } else {
+      2
+    }
+  }
+}