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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Concept subsumption broken with constrained + unconstrained parameter with terse syntax"
href="https://bugs.llvm.org/show_bug.cgi?id=50337">50337</a>
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<th>Summary</th>
<td>Concept subsumption broken with constrained + unconstrained parameter with terse syntax
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>davidfromonline@gmail.com
</td>
</tr>
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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
</td>
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<p>
<div>
<pre>The following valid translation unit:
```
template<typename T>
concept foo = true;
template<typename T>
concept foo2 = foo<T> and true;
void f(foo auto, auto) {
}
void f(foo2 auto, auto) {
}
void f() {
f(1, 1);
}
```
is rejected with
```
<source>:13:2: fatal error: call to 'f' is ambiguous
f(1, 1);
^
<source>:7:6: note: candidate function [with auto:1 = int, auto:2 = int]
void f(foo auto, auto) {
^
<source>:9:6: note: candidate function [with auto:1 = int, auto:2 = int]
void f(foo2 auto, auto) {
^
1 error generated.
Compiler returned: 1
```
This was broken in a recent commit (past couple of days). It's fine with
46c17429bc86dc5ccddb5512b77bd1ede39c9ccd but fails with
72797dedb720fae22682fc884cbf741c5a2066c2.
See it live: <a href="https://godbolt.org/z/EaGMs8dhT">https://godbolt.org/z/EaGMs8dhT</a></pre>
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