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// RUN: %clang_cc1 -E %s | FileCheck %s
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#define hash_hash # ## #
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#define mkstr(a) # a
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#define in_between(a) mkstr(a)
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#define join(c, d) in_between(c hash_hash d)
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// CHECK: "x ## y";
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join(x, y);
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#define FOO(x) A x B
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// CHECK: A ## B;
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FOO(##);
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