"xdefined twice" error message lacks a space
$ copar refine <<EOF
heredoc> 2
heredoc> x: 0
heredoc> x: 1
heredoc> EOF
(stdin):4:2:
|
4 | x: 1
| ^
xdefined twice
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$ copar refine <<EOF
heredoc> 2
heredoc> x: 0
heredoc> x: 1
heredoc> EOF
(stdin):4:2:
|
4 | x: 1
| ^
xdefined twice