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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - call to consteval in immediate invocation context fails"
href="https://bugs.llvm.org/show_bug.cgi?id=51840">51840</a>
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<th>Summary</th>
<td>call to consteval in immediate invocation context fails
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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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
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>cgnitash@gmail.com
</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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<pre>Reduced from <a href="https://stackoverflow.com/questions/69166564">https://stackoverflow.com/questions/69166564</a>
The following code fails on clang >= 11.0 (including trunk)
-----
consteval int f(int) { return 1; }
template <typename T>
consteval bool g(T a)
{
int n = f(a); // error here
return true;
}
static_assert(g(2));
-----
with
error: call to consteval function 'f' is not a constant expression
note: read of non-const variable 'a' is not allowed in a constant expression
This seems incorrect. The evaluation of `f` is in an immediate context, i.e.
inside `g` so `f(a)` should be a constant expression. Also, the error only
appears if `g` is a template, and if the result of `f(a)` is stored in a local
variable. GCC accepts the code.</pre>
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