Fix for Mark Tehver's bug report.

malcolm: Fri Aug 17 16:04:15 CEST 2001 Update of /usr/src/master/nhc/src/compiler98 In directory hinken:/tmp/cvs-serv18367 Modified Files: Need.hs Log Message: Fix for Mark Tehver's bug report. module Test2(Test(..)) where data Test {a0::Int, b0::Int} module Test1(fn) where import Test2 fn (Test {a0=a}) = a0 t + a gave "Unbound Identifier a0" error. The error was only visible with the combination of three circumstances: * field name is imported * field name is used in a lhs pattern * field name is also used as a selector on the rhs of the *same* equation. The fault was that the need-analysis was binding the selector name as if it were a pattern variable for the equation (as with puns), rather than generating a need for the imported selector.
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