• d-bugmail puremagic.com (47/49) Oct 14 2013 http://d.puremagic.com/issues/show_bug.cgi?id=11263

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=11263

           Summary: Better code formatting in error messages with refused
                    lambdas
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: minor
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



This is a low-priority spinoff of Issue 11258.


Kenji Hara:
 And I'd ask you one question: If the lambda has quite big body, how it will be
 output?

This is wrong example code:


struct Foo {
    static int spam = 1;
}
struct Bar {
    static assert(__traits(compiles, { auto x = Foo.spam; }));
}
void main() {}



dmd 2.064beta1 gives:

test.d(5): Error: static assert  (__traits(compiles, ()

{

auto x = Foo.spam;

}

)) is false




If the original code contains no newlines, then I think the compiler could
avoid adding any newline and just copy the original code:


test.d(5): Error: static assert(__traits(compiles, { auto x = Foo.spam; })) is
false


If at the time of the error printing the original formatting is lost, then the
situation becomes more complex and you essentially need a little code
beautifier like the GNU Indent program (http://www.gnu.org/software/indent/ ),
but this is too much large and complex to implement.

Having something like Indent in Phobos could be a good idea, but having it
inside the compiler seems a bit too much.

Perhaps during the generation of the error message the compiler could go back
to read the original source code.

If the solution is too much hard then please close down this issue.

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