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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - regression Clang >= 11 rejects consteval subscript operator use"
href="https://bugs.llvm.org/show_bug.cgi?id=50779">50779</a>
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<th>Summary</th>
<td>regression Clang >= 11 rejects consteval subscript operator use
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>11.0
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>wjwray@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>This is a regression between versions 10.0.1 and 11.0.0
<a href="https://godbolt.org/z/dcnbbcKqs">https://godbolt.org/z/dcnbbcKqs</a>
struct test
{
consteval int operator[](int i) const { return {}; }
};
constexpr test a{};
constexpr int s = a.operator[](1); // accept direct call
constexpr int t = a[1]; // REJECT
error: cannot take address of consteval function 'operator[]'
outside of an immediate invocation:
constexpr int t = a[1];
^
Works on GCC >=10.2 but ICE'd 10.1 (which introduced consteval)
internal compiler error: in extract_call_expr, at cp/call.c:6614
13 | constexpr int t = a[1];
| ^
Works on MSVC >= v19.28 (which introduced consteval)</pre>
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