as may write warnings and error messages to the standard error
file (usually your terminal). This should not happen when a compiler
as automatically. Warnings report an assumption made so
as could keep assembling a flawed program; errors report a
grave problem that stops the assembly.
Warning messages have the format
file_name:NNN:Warning Message Text
(where NNN is a line number). If a logical file name has been given
.app-file string) it is used for the filename,
otherwise the name of the current input file is used. If a logical line
number was given
then it is used to calculate the number printed,
otherwise the actual line in the current source file is printed. The
message text is intended to be self explanatory (in the grand Unix
Error messages have the format
file_name:NNN:FATAL:Error Message Text
The file name and line number are derived as for warning messages. The actual message text may be rather less explanatory because many of them aren't supposed to happen.
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