Options -Wmissed-specialisations, -Wall-missed-specialisations and -Werror

Ben Gamari ben at well-typed.com
Sat Jan 23 11:51:04 UTC 2016

Andrés Sicard-Ramírez <asr at eafit.edu.co> writes:

> Dear all,
> In GHC 8 RC 1, the `-Wmissed-specialisations` and
> `-Wall-missed-specialisations` options generate a warning instead of
> an error when using `-Werror`. Is it the expected behaviour?
I would say this can be considered correct. This warning is really
intended to let the user know that a specialization hasn't occurred;
fixing this may require changes in code which they have little control
over (e.g. adding an inline pragma to an upstream library).

Regardless, this behavior probably ought to be a bit better documented.
I've opened D1829 fixing this.


- Ben
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