On Thursday, 29 December 2016 at 20:55:43 UTC, Alexandru Ermicioi
wrote:
Given code below:
import std.stdio;
struct Annotation {
public int delegate(int) dg;
}
void main() {
import std.traits;
__traits(getAttributes, Cls)[0].dg(20).writeln;
}
@Annotation(delegate int(int d) {
return d;
})
class Cls {
void method() {
}
}
Dmd will complain with following statement for the delegate
passed in annotation:
src/app.d(13,13): Error: delegate app.__dgliteral6 is a nested
function and cannot be accessed from D main.
GDC will just throw internal compiler exception:
src/app.d: In function ‘D main’:
src/app.d:20:2: internal compiler error: in
get_frame_for_symbol, at d/d-codegen.cc:3981
__traits(getAttributes, Cls)[0].dg(20).writeln;
^
LDC will not argue, and compile it flawlessly, and return 20 as
expected.
So the question, is the dmd error correct behavior?
If so, how the delegate is nested, and what is context that it
is nested in?
DMD version is: v2.072.1
LDC version is: v1.1.0 based on v2.071.2 and LLVM 3.8.1
GDC version is: 6.2.1 20161215
It's a delegate and not function.
Therefore it will get a frame-ptr regardless, without checking if
it is needed or not, or if there is a frame to point to.
Since there is no frame to point to you get the error.
At least this is my guess.
Make the delegate a function and the error should disappear.
