new compile command doesn't coalesce errors on the same line

[Miles Bader]

If *compilation* looks like this:

cray.c:33: error: `driver_num' undeclared (first use in this function)
cray.c:33: error: (Each undeclared identifier is reported only once
cray.c:33: error: for each function it appears in.)
cray.c:36: error: too many arguments to function `make_driver'

Then the first next-error jumps to (having working around the problems
with next-error described in my previous mail) line 33.

However, the next 2 invocations of `M-x next-error' _also_ jump to line
33, which is obvious a bit of a pain (since multi-line error messages
like that are common from gcc).  The old compile command simply ignored
any error lines which were duplicates.

-Miles
-- 
Suburbia: where they tear out the trees and then name streets after them.