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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Lookup of non-dependent name performed in Phase 2"
href="https://llvm.org/bugs/show_bug.cgi?id=22971">22971</a>
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<th>Summary</th>
<td>Lookup of non-dependent name performed in Phase 2
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.6
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++11
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>sneves@dei.uc.pt
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Take the following example:
namespace ns1 {
template<typename T>
constexpr bool f(T const &) { return true; }
}
namespace ns2 {
template<typename T> struct S {};
}
template<typename = void>
constexpr int g() {
using ns1::f;
return f(ns2::S<int>());
}
namespace ns2 {
template<template<typename> class T, typename U>
constexpr bool f(T<U> const &) { return false; }
}
static_assert(g(), "");
In GCC and EDG the static_assert does not fail, i.e., g() calls f(T const&).
Clang, on the other hand, appears to examine g() at the instantiation point,
and calls the better fit f(T<U> const&).
My understanding of the standard is that, since ns2::S<int> is not a dependent
type, the lookup of f() should be performed in the context of g()'s definition
and not of its instantiation. So I think Clang is wrong here.</pre>
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</p>
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