no-prelude-import

Author: danakj

toolchain/testing/file_test.cpp

@@ -21,11 +21,6 @@
 #include "testing/file_test/file_test_base.h"
 #include "toolchain/driver/driver.h"
 
-// A flag specified by a test prelude to indicate the intention to include the
-// full production prelude.
-constexpr static llvm::StringLiteral ExpectFullPreludeFlag =
-    "--expect-full-prelude";
-
 namespace Carbon::Testing {
 namespace {
 
@@ -127,9 +122,11 @@ auto ToolchainFileTest::Run(
     filtered_test_args.reserve(test_args.size());
     bool found_prelude_flag = false;
     for (auto arg : test_args) {
-      bool custom_core = arg == "--custom-core";
-      bool full_prelude = arg == ExpectFullPreludeFlag;
-      if (custom_core || full_prelude) {
+      bool driver_flag = arg == "--custom-core" || arg == "--no-prelude-import";
+      // A flag specified by a test prelude to indicate the intention to include
+      // the full production prelude.
+      bool full_prelude = arg == "--expect-full-prelude";
+      if (driver_flag || full_prelude) {
         found_prelude_flag = true;
       }
       if (!full_prelude) {