This file is indexed.

/usr/share/highlight/langDefs/moon.lang is in highlight-common 3.41-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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dofile(HL_LANG_DIR.."lua.lang")

Description="MoonScript"

-- append keywords to Lua list
table.insert(Keywords,
  { Id=1,
    List={"class", "export", "import", "from", "extends", "module", "require"}
  }
)

table.insert(Keywords,
  { Id=3,
    Regex=[[@\w+]],
  }
)

table.insert(Keywords,
  { Id=4,
    Regex=[[\w+\:]],
  }
)

table.insert(Keywords,
  { Id=4,
    Regex=[[(\w+)?(\\\w+)]],
  }
)