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Syntax check is started by calling flymake-start-syntax-check-for-current-buffer
.
Flymake first determines whether it is able to do syntax
check. It then saves a copy of the buffer in a temporary file in the
buffer’s directory (or in the system temp directory, for java
files), creates a syntax check command and launches a process with
this command. The output is parsed using a list of error message patterns,
and error information (file name, line number, type and text) is
saved. After the process has finished, Flymake highlights erroneous
lines in the buffer using the accumulated error information.