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17773fcd83
default arguments to template parameters don't have a DeclContext when instantiated, and so we can't detect that we're in an instantiation context as opposed to the definition context. However, it fixes the more commonly-occuring cases in TMP code that use devolve to this type of tautology after substitution. llvm-svn: 108044
49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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template <int A, int B> void foo() {
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(void)(A == A); // expected-warning {{self-comparison always evaluates to true}}
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(void)(A == B);
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}
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template <int A, int B> struct S1 {
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void foo() {
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(void)(A == A); // expected-warning {{self-comparison always evaluates to true}}
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(void)(A == B);
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}
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};
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template <int A, int B> struct S2 {
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template <typename T> T foo() {
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(void)(A == A); // expected-warning {{self-comparison always evaluates to true}}
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(void)(A == B);
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}
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};
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struct S3 {
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template <int A, int B> void foo() {
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(void)(A == A); // expected-warning {{self-comparison always evaluates to true}}
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(void)(A == B);
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}
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};
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template <int A> struct S4 {
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template <int B> void foo() {
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(void)(A == A); // expected-warning {{self-comparison always evaluates to true}}
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(void)(A == B);
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}
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};
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const int N = 42;
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template <int X> void foo2() {
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(void)(X == N);
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(void)(N == X);
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}
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void test() {
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foo<1, 1>();
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S1<1, 1> s1; s1.foo();
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S2<1, 1> s2; s2.foo<void>();
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S3 s3; s3.foo<1, 1>();
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S4<1> s4; s4.foo<1>();
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foo2<N>();
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}
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