Keep getting Exception: (Sys_error "xxxx.swift: Read-only file system

[ShawnMa16]

Describe the bug
A clear and concise description of what the bug is.

I'm getting
Exception: (Sys_error "xxxx.swift: Read-only file system

when trying to run the command

COMBY_M="$(cat <<"MATCH"
switch :[case] {:[body]}
MATCH
)"
COMBY_R="$(cat <<"REWRITE"
switch :[case] {:[body]@unknown default: }
REWRITE
)"
COMBY_RULE="$(cat <<"RULE"
where match :[body] {
| ":[_]@unknown default::[_]" -> false
| ":[_]" -> true
}
RULE
)"
# Install comby with `bash <(curl -sL get.comby.dev)` or see github.com/comby-tools/comby && \
comby "$COMBY_M" "$COMBY_R"  -rule "$COMBY_RULE" .swift -stats -match-newline-at-toplevel -timeout 20 -I

Reproducing

• If this looks like a bug in the matcher, go to https://comby.live and paste a shared link below:

• If this is not about a matcher, please describe the bug:

Expected behavior
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Additional context
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