Private field is not resolved properly in templates

# a.nim import b, c var f: Foo let nb = newBar(f.field)

# b.nim type Bar* = tuple[x: int] template newBar*(b: int): Bar = (x: b).Bar

# c.nim type Foo* = object mField: int template field*(f: Foo): int = f.mField

Error:

$ nim c a.nim a.nim(4, 16) template/generic instantiation from here c.nim(4, 33) Error: undeclared field: 'mField'

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