Re: is(this == bug) ???

[Andrei Alexandrescu]

dsimcha wrote:
== Quote from dsimcha (dsim...@yahoo.com)'s article
void doStuff(T)(T arg)
if(is(typeof(arg))) {
}
void main() {
    doStuff(1);
}
Results:
test7.d|6|template test7.doStuff(T) if (is(typeof(arg))) does not match any
function template declaration|
test7.d|6|template test7.doStuff(T) if (is(typeof(arg))) cannot deduce
template function from argument types !()(int)|
This code does not compile with 2.027, 2.026, or 2.016 (the first version that
had constraints).  If it is, in fact, a bug, I find it amazing that it's
apparently taken over half a year for anyone to notice.  (Searching bugzilla
for "constraints" yields nothing.)  If it's not a bug, then I can't for the
life of me figure out why it won't compile.

(Slapping forehead)

Never mind.  After struggling with this for an hour, I realized that arg is not 
in
scope when the constraint is evaluated.

No, no, always mind. The parameter name should be visible in the 
if-constraint of a template. Please file a bug.

Also the parameter names should be visible in the return type (if it 
uses e.g. sizeof or typeof). I think I filed that.


Andrei