Robert Widmann d52b33d409 Special-case Pattern Binding Decls Created by LLDB ...

When LLDB wraps a user-defined expression in the REPL, it takes something like this
```
<expr>
```

and turns it into (very very abstractly)

```
var result
do {
  result = <expr>
}
print(result)
```

In the process, it creates an implicit pattern binding and an implicit do block. Of these, only the implicit do is considered by ASTScope lookup to be relevant. This presents a problem when <expr> is or contains a closure, as the parameters of that closure are defined within a scope that will never be expanded. Thus,

```
> [42].map { x in x } // <- cannot find 'x' in scope
```

This patch provides the Swift half of the fix wherein we privilege pattern bindings created by the debugger and look through them to the underlying user expression when performing ASTScope expansion.

rdar://78256873

2021-06-01 22:25:17 -07:00

12 KiB

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