Unify patterns and function bindings

The following program:

a | True = 1
a | False = 2

produces an error (on 7.4.1 and 7.7.2012117):

Conflicting definitions for 'a'

The following two examples produce no error:

b | True = 1
  | False = 2

c _ | True = 1
c _ | False = 2

I would expect a, b. and c () to have identical behaviour.

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture