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These sections are meant only for the internal use of as. They
have no meaning at run-time. You do not really need to know about these
sections for most purposes; but they can be mentioned in as
warning messages, so it might be helpful to have an idea of their
meanings to as. These sections are used to permit the
value of every expression in your assembly language program to be a
section-relative address.
An internal assembler logic error has been found. This means there is a bug in the assembler.
The assembler stores complex expression internally as combinations of symbols. When it needs to represent an expression as a symbol, it puts it in the expr section.