Not all blocks are parsed

[bombsimon]

Must be more generous about when to enter a block and parse it.

Gives no error but should

var foo string

func() {
    var err error
    foo = "1"
}

Gives error if assigned to variable

var foo string

x := func() {
    var err error
    foo = "1"
}

assignments should only be cuddled with other assignments

Also this gives no error, assignign or not:

var err error
foo, err = func() { return "", nil }

[bombsimon]

I think the last statement is actually OK. It doesn't yield an error because err is used in the assignment on the second line and I think that is actually ok!