I have a solution to Issue 388 at
https://github.com/nordlow/dmd/commits/master
that works nicely for my projects.
This patch however generates a handful of warnings in Phobos
unittests.
All of these are IMO fixable except for one which I don't know
how to fix namely the definition of assertCTFEable in exception.d
I need to change this to explicitly capture the return value of
the template alias argument dg when this is non-void. My try so
far was to change
version(unittest) package
@property void assertCTFEable(alias dg)()
{
static assert({ dg(); return true; }());
dg();
}
to
version(unittest) package
@property void assertCTFEable(alias dg)()
{
static assert
({
static if (is(typeof(db()) == void)) {
dg();
} else {
auto x = dg();
}
return true;
}());
static if (is(typeof(db()) == void)) {
dg();
} else {
auto x = dg();
}
}
gives the following error when in Phobos make unittest:
std/exception.d(1392): Error: variable
std.exception.assertCTFEable!(function ()
{
S[] r = array(repeat((S __ctmp1582 = 0;
, __ctmp1582).this(1), 2LU));
assert(equal(r, [(S __ctmp1591 = 0;
, __ctmp1591).this(1), (S __ctmp1592 = 0;
, __ctmp1592).this(1)]));
}
).assertCTFEable.__lambda1.x type void is inferred from
initializer (*function ()
{
S[] r = array(repeat((S __ctmp1582 = 0;
, __ctmp1582).this(1), 2LU));
assert(equal(r, [(S __ctmp1591 = 0;
, __ctmp1591).this(1), (S __ctmp1592 = 0;
, __ctmp1592).this(1)]));
}
)(), and variables cannot be of type void
std/exception.d(1392): Error: expression (*function ()
{
S[] r = array(repeat((S __ctmp1582 = 0;
, __ctmp1582).this(1), 2LU));
assert(equal(r, [(S __ctmp1591 = 0;
, __ctmp1591).this(1), (S __ctmp1592 = 0;
, __ctmp1592).this(1)]));
}
)() is void and has no value
How can I in a general way check if dg evaluates to void or not?
