[Issue 12280] New: Redundant "template instance ... error instantiating" messages

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12280

           Summary: Redundant "template instance ... error instantiating"
                    messages
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: diagnostic
          Severity: enhancement
          Priority: P3
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: thecybershadow at gmail.com


--- Comment #0 from Vladimir Panteleev <thecybershadow at gmail.com> 2014-03-01 00:24:41 EET ---
Consider the program:

/////// test.d ///////
void f(int i)()
{
    static if (i < 10)
        f!(i+1);
    else
        nonexistent();
}

alias f0 = f!0;
//////////////////////

When compiled, the compiler output is:

test.d(6,3): Error: undefined identifier nonexistent
test.d(4,3): Error: template instance test.f!10 error instantiating
test.d(9,12):        11 recursive instantiations from here: f!0
test.d(4,3): Error: template instance test.f!9 error instantiating
test.d(9,12):        10 recursive instantiations from here: f!0
test.d(4,3): Error: template instance test.f!8 error instantiating
test.d(9,12):        9 recursive instantiations from here: f!0
test.d(4,3): Error: template instance test.f!7 error instantiating
test.d(9,12):        8 recursive instantiations from here: f!0
test.d(4,3): Error: template instance test.f!6 error instantiating
test.d(9,12):        7 recursive instantiations from here: f!0
test.d(4,3): Error: template instance test.f!5 error instantiating
test.d(4,3):        instantiated from here: f!4
test.d(4,3):        instantiated from here: f!3
test.d(4,3):        instantiated from here: f!2
test.d(4,3):        instantiated from here: f!1
test.d(9,12):        instantiated from here: f!0
test.d(4,3): Error: template instance test.f!4 error instantiating
test.d(4,3):        instantiated from here: f!3
test.d(4,3):        instantiated from here: f!2
test.d(4,3):        instantiated from here: f!1
test.d(9,12):        instantiated from here: f!0
test.d(4,3): Error: template instance test.f!3 error instantiating
test.d(4,3):        instantiated from here: f!2
test.d(4,3):        instantiated from here: f!1
test.d(9,12):        instantiated from here: f!0
test.d(4,3): Error: template instance test.f!2 error instantiating
test.d(4,3):        instantiated from here: f!1
test.d(9,12):        instantiated from here: f!0
test.d(4,3): Error: template instance test.f!1 error instantiating
test.d(9,12):        instantiated from here: f!0

However, only the first 3 lines describe the error adequately. The "template
instance ... error instantiating" lines are redundant, as the template
instantiation trace is printed already.

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