class Tilt::Template

reporting in Kernel::caller and backtraces.
source line offset, so adding code to the preamble does not effect line
assignment only. Lines included in the preamble are subtracted from the
locals assignment. The default implementation performs locals
Generates preamble code for initializing template state, and performing

def precompiled_preamble(locals)
  locals.map { |k,v| "#{k} = locals[#{k.inspect}]" }.join("\n")
end