Pretty printer bad formatting

When compiling with -fwarn-incomplete-patterns, the first test case s17.hs (attached) outputs unmatched patterns correctly.

test.hs:4:1: Warning:
    Pattern match(es) are non-exhaustive
    In an equation for `f':
        Patterns not matched:
            B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _
            B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ A B
            B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ A B B _
            B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ B _ A B A B
            ...

However, when compiling s18.hs each argument is printed on its own line. 16 lines of the output are included below.

test.hs:4:1: Warning:
    Pattern match(es) are non-exhaustive
    In an equation for `f':
        Patterns not matched:
            B
            _
            B
            _
            B
            _
            B
            _
            B
            _
            B
            _

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	lowest
Resolution	Unresolved
Component	Driver
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

mentioned in issue #8403 (closed)

changed weight to 0

added Tbug Trac import driver labels

Attached file s17.hs ($1011).

s17.hs

Attached file s18.hs ($1012).

s18.hs

closed

This seems like another instance of #8403 (closed) (Pretty-printing of long types). I added a link back to this ticket from there.

terrelln: thanks for the bug report. Please reopen if you disagree.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedDuplicate
Component	Driver → Compiler
Related	→ #8403 (closed)

removed driver label

added driver label

added Plow label