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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - considering conversion functions in the context of copy-initializing a type from the same type"
href="https://bugs.llvm.org/show_bug.cgi?id=51549">51549</a>
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<th>Summary</th>
<td>considering conversion functions in the context of copy-initializing a type from the same type
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>11.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>barry.revzin@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>Reduced from StackOverflow (<a href="https://stackoverflow.com/q/68853472/2069064">https://stackoverflow.com/q/68853472/2069064</a>):
template <typename T>
concept Numeric =
requires(T a) {
foo(a);
};
struct Deferred {
friend void foo(Deferred);
template <Numeric TO> operator TO();
};
static_assert(Numeric<Deferred>);
clang is trying to check to see if a.operator Derived() is a valid expression
as part of checking if foo(a) is valid. But we shouldn't be going that route
here at all, copy-initializing a Derived from an lvalue of type Derived should
only check constructors, not conversion functions.</pre>
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