New type decoder test to verify that variadic tuples are rejected

Author: tbkka

test/TypeDecoder/invalid_types.swift

@@ -0,0 +1,12 @@
+// RUN: %empty-directory(%t)
+
+// RUN: %target-build-swift -emit-executable %s -g -o %t/structural_types -emit-module
+// RUN: sed -ne '/\/\/ *DEMANGLE: /s/\/\/ *DEMANGLE: *//p' < %s > %t/input
+// RUN: %lldb-moduleimport-test %t/structural_types -type-from-mangled=%t/input | %FileCheck %s
+
+
+// If this were supported, it would be `(t: τ_0_0...)`
+// But tuples with a variadic 'd' marker are not actually valid Swift types, so
+// the type decoder rejects them.
+// DEMANGLE: $sx1td_t
+// CHECK: Can't resolve type of $sx1td_t