'main': simple parameter expansions at command word: Don't use an undefined value.
Causes such expansions to be highlighted as [unknown-token] rather than as default (absent from $region_highlight). Fixes #337.
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@ -374,7 +374,9 @@ _zsh_highlight_main_highlighter()
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local -a match mbegin mend
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local -a match mbegin mend
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local MATCH; integer MBEGIN MEND
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local MATCH; integer MBEGIN MEND
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if [[ $res == none ]] && (( ${+parameters} )) &&
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if [[ $res == none ]] && (( ${+parameters} )) &&
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[[ ${arg[1]} == \$ ]] && [[ ${arg:1} =~ ^([A-Za-z_][A-Za-z0-9_]*|[0-9]+)$ ]]; then
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[[ ${arg[1]} == \$ ]] && [[ ${arg:1} =~ ^([A-Za-z_][A-Za-z0-9_]*|[0-9]+)$ ]] &&
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(( ${+parameters[${MATCH}]} ))
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then
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_zsh_highlight_main__type ${(P)MATCH}
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_zsh_highlight_main__type ${(P)MATCH}
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res=$REPLY
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res=$REPLY
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fi
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fi
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