RedundantBraces: fix "moving" braces around func #3834
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Previously, we'd handle the case of `foo(x => { ... })` by:
1. replacing the `(` with a `{`
2. "pretending" to replace the `{` with a `(`
3. upon encountering the `}` for a fake `(`, removing the `(` and
changing on the owner of the `}`
4. then removing the `)`
Instead, let's modify steps 2, 3 and 4 as follows:
2. remove `{`
3. remove `}`
4. replace the closing `)` with a `}` moving it to the position of the
`}` in step 3, along with token ownership.
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Previously, we'd handle the case of
foo(x => { ... })by:(with a{{with a(}for a fake(, removing the(and changing on the owner of the})Instead, let's modify steps 2, 3 and 4 as follows:
{})with a}moving it to the position of the}in step 3, along with token ownership.