[ruby-core:112668] Impossible to pattern-match against the return value of a method

Given the following snippet:

```
def foo = "foo"
def bar = "bar"
text = "foo"
matches = text in bar
```

The result will be "true", and bar is now a local variable with value "foo".

If you instead try

```
def foo = "foo"
def bar = "bar"
text = "foo"
matches = text in ^bar
```

You get SyntaxError: "bar: no such local variable"

The only way I've found to be able to do this as a one-liner is with something like:

```
def foo = "foo"
def bar = "bar"
text = "foo"
matches = text in ^(tmp = bar)
```

Anyone else find this behaviour a bit odd?
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