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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang rejects braced-init-list as default non-type template parameter"
href="https://bugs.llvm.org/show_bug.cgi?id=50634">50634</a>
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<th>Summary</th>
<td>Clang rejects braced-init-list as default non-type template parameter
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>12.0
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<th>Hardware</th>
<td>PC
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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>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>pilarlatiesa@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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<pre>Clang rejects this code:
```c++
template<bool = {}>
int f() {}
```
with:
<span class="quote">> error: expected expression</span >
However I believe that the C++ grammar permits that.
[temp.param]:
<span class="quote">> The syntax for template-parameters is:
> template-parameter:
> type-parameter
> parameter-declaration</span >
[dcl.fct]:
<span class="quote">> parameter-declaration:
> attribute-specifier-seq_{opt} decl-specifier-seq declarator
> attribute-specifier-seq_{opt} decl-specifier-seq declarator = initializer-clause
> attribute-specifier-seq_{opt} decl-specifier-seq abstract-declarator_{opt}
> attribute-specifier-seq_{opt} decl-specifier-seq abstract-declarator</span >
_{opt} = initializer-clause
[dcl.init]:
<span class="quote">> initializer-clause:
> assignment-expression
> braced-init-list</span >
My motivating usecase is:
```c++
template<std::true_type = {}>
int f() {}
```
which is accepted by G++.</pre>
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