Claus Reinke wrote:
Consider this code and session:
f x y z | x<y = z
| otherwise = z*y
...
Things to note:
- when reaching the breakpoint "in" 'f', one isn't actually in 'f' yet -
nothing
about 'f' can be inspected
- at no point in the session was 'x' inspectable, even though it is
likely to
contain information needed to understand 'f', especially when we are
deep in a recursion of a function that can be called from many places;
this information doesn't happen to be needed in the current branch,
but debugging the current expression always happens in a context, and
accessing information about this context is what the GHCi debugger
doesn't seem to support well
In this particular example, the second item is most likely a bug (the
free variables of the guard were never offered for inspection).
Indeed it was a bug, the same as #2740, and I've just fixed it. Thanks for
boiling it down to a nice small example.
Cheers,
Simon
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