Harlan Haskins 7fd8649d30 [AST] Handle printing default values for tuples of nils ...

If a var has optional type, e.g.

```
var x: Int?
```

It will be implicitly initialized to `nil`. However, there's a second,
undocumented behavior: tuples of optional type, potentially nested infinitely,
will also be initialized, to tuples of nil.

So this var

```
var w: ((Int?, (), Int?), (Int?, Int?))
```

Will be default-initialized to

```
((nil, (), nil), (nil, nil))
```

We need to handle this inside getDefaultValueStringRepresentation,
otherwise we will crash while emitting partial modules.

Fixes one instance of rdar://51560190

2019-08-06 11:58:50 -07:00

4.7 KiB

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