Discussion
Line number information is maintained by the compiler chiefly so that
Answer: D
Correct answer: diagnostic messages can point the programmer to the right place
An error message giving no location is nearly useless in a large file, so the scanner records line and column with each token and later phases carry the information through the tree.
The same information also feeds the debugging tables, which map machine addresses back to source lines. Optimisation, linking and loading all work on representations from which source positions have been abstracted away; only the diagnostics need to reach back.
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