Initialization of a struct-typed template parameter from a different type fails.

[maxsamukha]

struct S
{
    this(int x) {}
}

void foo(S a = 0)
{
}

template Foo(S a = 0)
{
}

void main(){
    S a = 0; // ok
    foo(); // ok
    alias F = Foo!(); // fails, should compile
}

[Dishantdhyani]

@maxsamukha can i work on this issue??

[maxsamukha]

can i work on this issue??

Nobody can work on D templates.

[Dishantdhyani]

why sir ??

[maxsamukha]

why sir ??

Ignore me. I'm just being annoyed by another series of bugs/unspecified behavior in the fundamentals.

[ntrel]

Not just structs:

// Error: template instance `f!()` does not match template declaration `f(int[1] a = [])`
alias g = f!();
template f(int[1] a = [])
{
}

But changing the default argument to [1] then works.

[dkorpel]

For local variables, that array initializer errors:

Error: mismatched array lengths, 1 and 0
    int[1] a = [];
           ^

But initialization by element value does work and could also be allowed for template parameters:

alias g = f!();
template f(byte[3] a = -1)
{
}