Bug 12280 – Redundant "template instance ... error instantiating" messages

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.

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/75356c630f43b8c630ca79cf60d66f3714cfaa72 fix Issue 12280 - Redundant "template instance ... error instantiating" messages https://github.com/D-Programming-Language/dmd/commit/fbffd20a8587888e0dafd8353e6cc23b910932fe Merge pull request #3373 from 9rnsr/fix12280 Issue 12280 - Redundant "template instance ... error instantiating" messages