C++ lambda in default template argument is incorrectly highlighted as error

[MC-DeltaT]

Name of the lexer
C++

Code sample

template<auto F = []{}>
void func();

Demo: http://rouge.jneen.net/v3.29.0/cpp/dGVtcGxhdGU8YXV0byBGID0gW117fT4Kdm9pZCBmdW5jKCk7Cg

Additional context
In general, I'd expect that any expression is valid in a template argument default.

[MC-DeltaT]

Actually seems like any braces in a template argument default is incorrectly highlighted as an error.

E.g. with a requires expression:

template<auto F = requires { foo(); }>
void func();

Demo: http://rouge.jneen.net/v3.29.0/cpp/dGVtcGxhdGU8YXV0byBGID0gcmVxdWlyZXMgeyBmb28oKTsgfT4Kdm9pZCBmdW5jKCk7Cg