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List: nhc-cvs
Subject: [cvs-nhc98] Fix a bug in translating (n+k) patterns to code.
From: malcolm () sparud ! net (Malcolm Wallace)
Date: 2001-09-14 16:12:58
Message-ID: 20010914161258.A8C20D91C () mail ! sparud ! net
[Download RAW message or body]
malcolm: Fri Sep 14 18:12:57 CEST 2001
Update of /usr/src/master/nhc/src/compiler98
In directory hinken:/tmp/cvs-serv722
Modified Files:
Case.hs
Log Message:
Fix a bug in translating (n+k) patterns to code.
The symptom was that
foo (n+1) Foo = 1
foo (n+1) Bar = 2
foo _ _ = 3
main = print (foo 1 Bar)
was offering 3 as result, not 2 as expected.
The cause was that the two equations were being matched in an
nested if..then..else sequence, with (n>=1) as the condition.
The correct way is to sequence the matches with FATBAR, so the
second match is actually attempted.
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