<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/96278>96278</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang(trunk) fails to compile std::replace_if
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          mrdaybird
      </td>
    </tr>
</table>

<pre>
    CE: https://godbolt.org/z/e9T7MYeE5
Program:
```
#include <algorithm>
#include <vector>
#include <cstdint>

void replace_if_epi8(std::vector<int8_t>& v) {
    std::replace_if(v.begin(), v.end(), [](int8_t x){return x == 13 || x == -12; }, 42);
}

void replace_if_epi32(std::vector<int32_t>& v) {
    std::replace_if(v.begin(), v.end(), [](int8_t x){return x == 13 || x == -12; }, 42);
}
```

Output:
```
In file included from <source>:1:
In file included from /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/algorithm:60:
In file included from /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/bits/stl_algobase.h:64:
In file included from /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/bits/stl_pair.h:60:
/opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/type_traits:549:30: error: use of class template '__is_pointer' requires template arguments; argument deduction not allowed in function return type
  549 |     : public __bool_constant<__is_pointer(_Tp)>
      | ^~~~~~~~~~~~
/opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/bits/cpp_type_traits.h:366:12: note: template is declared here
  366 |     struct __is_pointer : __truth_type<_IsPtr>
      |            ^
1 error generated.
```

Note: This was not a issue a few weeks ago on trunk. 
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzUVj1z4zYQ_TVQsyMOBfCzYCHJ1swVSa5wk4oDAisKOQhg8CHbKfLbM6BkSbmzrz5zOORgsbt4-_iwBPdejQaxI-WGlA8LHsPBuu7oJH8dlJOLwcrXbvtI2BoOIUyesDWhO0J3o5WD1SGzbiR09w-hO2yf6t_-xMeS5A8kX391dnT8mALmManyy30eUqaM0FEiELblerROhcORsMf35k8ognUfTAofpDLhNjs_T1ZJcDhpLrBX-x4n1RDa-CATJLZ-S7lVJjT9HE0rOBHaAqk35xwAANeAWy5Cm1M24KgMoQ2hLaFbOGVo5G145pPQ5pwdXpK93jgM0Rl4AcIeCHuAFQNSb0m9vZmWK0rYBkj9kPIUNAWyC55k_HmJjH5UI6OfrsjvFDM__4hhiuEjVX0xsFca4aIOCXtnj0kj3kYnMNXP1qtr9AfudGenQOhO2OOkNLolvkzaOnRJ90IsveGTP9jkotVwNhK6e2mqviqWWpn4shxNJHS3KrM8ywndZdmPj8uqaSFCN_N9C7jbEesq_wyIBxU8oTsfdJ_AD9xjdkjoi0-GfuLKnZHfeP8lMIbXCfvgeILK1mXRErZmCSOgc2mfryF6BLsHobn3EPA4aR4QCK37Xvl-ssqEBLkGh39H5fDOibsxHtGk3JvrACTKKIKyBowNwLW2zyhBGdhHc7ZftnsC99ZQyiL1l23qLJBQTXHQSkDfD9bqXljjA08Ne_t_VE3_NM2d4PHWmWBORMrHf2_XL_RJLrIR09TffZ1ZPayqUrOhiQBjA6b3lWzlQaLQ3KGEA7orc6yqrsz54KIIcM_RzGbfBxfDYV4wcfjFfw3uHdLuLlJeZldnqcCIBh0PKLOf9NrfL6ifDsrDM_dnCYDyPiJw2OMzPCN-88BHC9ZAcNF8y2AhOyZb1vIFdqt61bRFkxfN4tANpRwaVnBW7_OiavatKGuJVV3tsR74ql6ojua0yCu6yktW5E0m2kpy5G1ecsabJidFjkeudKb16ZjOHosZTNdWtG4Wmg-o_XyWoVRobkZCaTrWuC75L4c4elLkWvngbxmCChq7i3sz15D-j3uutIdg4SKv9_6Ri-h09925SIVDHDJhj0l2-vT2Wk7O_oUiiXGGnFRzRn3q6H8BAAD__-lwz0c">