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/usr/share/nano/texinfo.nanorc is in nano 2.5.3-2.

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## Here is an example for Texinfo files.

syntax "texinfo" "\.texi$"
header "^\\input texinfo"
magic "Texinfo source text"

# Command arguments, trailing and enclosed.
color cyan "^@[a-z]+[[:space:]]+.*$"
color brightmagenta "@[a-z]+\{[^}]*\}"
# Commands themselves.
color yellow "@[a-z]+\{?" "\}"

# Menu items.
color brightred "^\*[[:space:]]+.*::.*$"

# Comments.
color green "@c[[:space:]]+.*$"

# Trailing whitespace.
color ,green "[[:space:]]+$"