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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ICE] consteval crash with fmtlib"
href="https://bugs.llvm.org/show_bug.cgi?id=51938">51938</a>
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<th>Summary</th>
<td>[ICE] consteval crash with fmtlib
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>12.0
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tim@klingt.org
</td>
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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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<p>
<div>
<pre>compiling fmtlib/spdlog with appleclang from xcode-12.5 and xcode-13 in c++20
mode gives me an ICE.
trying to reduce the test case with cvise i ended up with this reproducer:
```
struct basic_format_string { template < typename S > consteval
basic_format_string(S
} using format_string = basic_format_string;
format(format_string ;
using filename_t = int;
template < typename > struct rotating_file_sink {
filename_t calc_filename(}
template < typename Mutex > filename_t rotating_file_sink< Mutex
<span class="quote">>::calc_filename() {</span >
filename_t ext;
format(ext)}
template class rotating_file_sink< int >;
```</pre>
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