class SyntaxTree::Parser

def on_string_concat(left, right)

) -> StringConcat
StringLiteral right
(StringConcat | StringLiteral) left,
on_string_concat: (
:call-seq: 
def on_string_concat(left, right)
  StringConcat.new(
    left: left,
    right: right,
    location: left.location.to(right.location)
  )
end