Parse error for functions

[skovhus]

This fails to parse:

foo() (
  true
)

Note that a function's body can be any Compound Command, so it's also legal to write:

bar() [[ -e foo ]]
baz() if [[ $a = $b ]]; then
  echo 1
else
  echo 2
fi

Originally from bash-lsp/bash-language-server#133

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