diff --git a/src/Sema.zig b/src/Sema.zig
index c8b905f23f..29cad45f9a 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -6158,6 +6158,9 @@ fn zirParamAnytype(
             // function type of the function instruction in this block.
             return;
         }
+        if (null != try sema.typeHasOnePossibleValue(block, src, param_ty)) {
+            return;
+        }
         // The map is already populated but we do need to add a runtime parameter.
         try block.params.append(sema.gpa, .{
             .ty = param_ty,
diff --git a/test/behavior/translate_c_macros.zig b/test/behavior/translate_c_macros.zig
index 7f8a35f5a1..3dd7f5aad7 100644
--- a/test/behavior/translate_c_macros.zig
+++ b/test/behavior/translate_c_macros.zig
@@ -39,7 +39,7 @@ test "reference to a struct type" {
 }
 
 test "cast negative integer to pointer" {
-    if (builtin.zig_backend != .stage1) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
 
     try expectEqual(@intToPtr(?*anyopaque, @bitCast(usize, @as(isize, -1))), h.MAP_FAILED);
 }
diff --git a/test/behavior/tuple.zig b/test/behavior/tuple.zig
index 81c5ac0e1f..91be6e51e4 100644
--- a/test/behavior/tuple.zig
+++ b/test/behavior/tuple.zig
@@ -50,7 +50,11 @@ test "tuple multiplication" {
 }
 
 test "more tuple concatenation" {
-    if (builtin.zig_backend != .stage1) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
 
     const T = struct {
         fn consume_tuple(tuple: anytype, len: usize) !void {