On Wednesday, 25 October 2017 at 20:04:47 UTC, Adam D. Ruppe
wrote:
On Wednesday, 25 October 2017 at 19:50:31 UTC, SrMordred wrote:
so why this line resolves to false?
Because it is illegal to put a statement or declaration inside
__traits(compiles). sorry, I should have said that before...
even though the mixin can be legal in another context, it won't
be in the __traits context due to this:
https://dlang.org/spec/traits.html#compiles
"Returns a bool true if all of the arguments compile (are
semantically correct). The arguments can be symbols, types, or
expressions that are syntactically correct. The arguments
cannot be statements or declarations. "
When there's a closing ;, it is a mixin statement.
void F(){}
pragma(msg, __traits( compiles, mixin("F();") ) );//false
Oh, now thats explains. I thought that a "mixin statement" was
equal to the argument type that it compiles to. Thanks!
