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-rw-r--r--tests/preprocessor/define-redefine.slang10
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diff --git a/tests/preprocessor/define-redefine.slang b/tests/preprocessor/define-redefine.slang
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+++ b/tests/preprocessor/define-redefine.slang
@@ -0,0 +1,10 @@
+//TEST:SIMPLE:
+
+// Confirm that we handle redefinition
+// of an existing define (with a diagnostic)
+
+#define FOO 1.0f
+
+float foo() { return FOO + 2.0; }
+
+#define FOO 2.0f