Precedence and associativity rules ignored when mixing infix type and data constructors in a single expression

The following code:

infixr 5 `Foo`
infixr 6 `Bar`

data a `Foo` b = a `FOO` a `Bar` b
data a `Bar` b = a `BAR` b

fails to compile, ignoring the fixity declarations. It should be parsed as a FOO (a Bar b) but currently the parentheses are required, which misses the point of fixity annotations.

Trac metadata

Trac field	Value
Version	6.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown