Comment 2 for bug 912075

Here is an even more minimal example:

def curry0_(f :: () -> r) :: () -> r:
    return f(...)
def curryio0_(f :: () ->io r) :: () ->io r:
    return f(...)

The problem is because the closure template for partially-applying f is being given the same name in both instances: "ct:ty:v1f1:0".