Also, a call stack frame is just a (name, srcloc) pair, so you can
format it yourself. I use:
show_stack :: CallStack -> String
show_stack = maybe "<empty-stack>" show_frame . Seq.last . Stack.getCallStack
where
show_frame (name, srcloc) =
SrcLoc.srcLocFile srcloc ++ ":" ++ show (SrcLoc.srcLocStartLine srcloc)
++ " [" ++ name ++ "]"
On Sun, Dec 6, 2015 at 8:56 PM, Richard Eisenberg
That looks like exactly what I want. Thanks.
There remain two mysteries: - I thought that CallStacks were a new feature that would come with GHC 8.0. Yet it seems the datatype is present in base-4.8.x. Even though the docs even say (wrongly, evidently) that it's in base since 4.9.
I've been using it since 7.10, with base 4.8. There's also a back port to 7.8, but it's not in the official distribution.