Just as an addendum, this just happened again, but I got new errors
this time. Make gave the usual:
Linking build/test/RunTests ...
Undefined symbols:
"_UiziTrackC_d28LF", referenced from:
_s28UI_info in TrackC.o
"_UiziRulerC_dk8C", referenced from:
_skev_info in RulerC.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
But then reloading that same module in ghci gave a new one:
> :r
[ 23 of 124] Compiling Ui.UiMsg ( Ui/UiMsg.hs, interpreted )
Ui/UiMsg.hs:51:31:
Can't find interface-file declaration for type constructor or
class Key.Modifier
Probable cause: bug in .hi-boot file, or inconsistent .hi file
Use -ddump-if-trace to get an idea of which file caused the error
In the type `[Key.Modifier]'
In the definition of data constructor `Mouse'
In the data type declaration for `Data'
The odd thing is that after restarting ghci and loading there was no
problem, so I didn't get a chance to try its -ddump-if-trace
suggestion. In this case before the reload I had added an instance
declaration to a type in the Key module, though oddly it wasn't the
referenced Modifier type.
Removing the referenced .o files and recompiling was enough to fix the
link error.
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