/usr/bin/ruby-parse is in ruby-whitequark-parser 2.4.0.2-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/usr/bin/ruby
$LOAD_PATH.unshift(File.expand_path('../../lib', __FILE__))
require 'parser/runner/ruby_parse'
Parser::Runner::RubyParse.go(ARGV)
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