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

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The actual contents of the file can be viewed below.

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dofile(HL_LANG_DIR.."c.lang")

Description="UPC (and C, technically)"

-- append keywords to C keywords
table.insert(Keywords,
  { Id=1,
    List={"upc_blocksizeof", "upc_elemsizeof", "upc_localsizeof", "shared", 
          "strict", "relaxed", "upc_barrier", "upc_notify",
           "upc_wait", "upc_fence"}
  }
)

table.insert(Keywords,
  { Id=2,
    List={"upc_lock_t"}
  }

)