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bug#44724: Uninitialised variables in syntax.c cause trouble.
From: |
Alan Mackenzie |
Subject: |
bug#44724: Uninitialised variables in syntax.c cause trouble. |
Date: |
Wed, 18 Nov 2020 17:38:34 +0000 |
Hello, Emacs.
On the master branch.
In src/syntax.c, there are several uninitialised static variables, one of
which is find_start_value.
It is used in function find_defun_start before being initialised. The
first use is at L.14 of the function, this:
&& pos >= find_start_value
. This has the effect of causing a certain (forward-comment -1) (which
calls back_comment, which calls find_defun_start) to fail.
In my test setup (I am writing tests for syntax.c), find_start_value's
value at loading time was randomly 1270, which was spuriously inside the
comment I was trying to scan backwards over. back_comment thus failed to
recognise the comment, and returned failed.
All these variables need initialising to something if the code in
syntax.c is to work properly.
--
Alan Mackenzie (Nuremberg, Germany).
- bug#44724: Uninitialised variables in syntax.c cause trouble.,
Alan Mackenzie <=