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/usr/share/highlight/langDefs/scala.lang is in highlight-common 3.18-3.

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-- Load Java definition
dofile(HL_LANG_DIR.."java.lang")

Description="Scala"

-- append keywords to Java keywords
table.insert(Keywords,
  { Id=1,
    List={"abstract", "def", "object", "override", "sealed", "trait", "type", "val", "var", "yield"},
  }
)

Strings={
  Delimiter=[["""|"|']],
}