https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128540
Bug ID: 128540
Summary: internal compiler error (while printing a diagnostic):
tree check ... at cp/cxx-pretty-print.cc
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: 0599jiangyc at gmail dot com
Target Milestone: ---
The following code:
```cpp
template<auto ns>
void f ()
{
namespace j = [:ns:];
int j = 0;
}
```
Resulted in this output:
```
<source>:5:7: error: 'int j' redeclared as different kind of entity
[-Wtemplate-body]
tree check: expected tree that contains 'decl minimal' structure, have
'splice_expr' in pp_cxx_namespace_alias_definition, at
cp/cxx-pretty-print.cc:2301
```
Trunk reproducer (`-std=c++26 -freflection`): https://godbolt.org/z/rn7fvaY93
