[Ur] very long error messages

[Gergely Buday]

Hi,

on a large program I got an error message of almost 180 thousand lines.

0:0-0:0: Some constructor unification variables are undetermined in declaration
(look for them as "<UNIF:...>")

It seemed to be too difficult to figure out what the problem is, but
then a simple search for UNIF showed me a function, for which
supplying a return type solved the problem.

I suggest that the compiler should trim down the output to the
functions in which those UNIF variables are present. Adam, what do you
think of this?

- Gergely