Auto-newline insertion
======================
Auto-newline minor mode works by enabling certain "electric
commands". Electric commands are typically bound to special characters
such as the left and right braces, colons, semi-colons, etc., which when
typed, perform some magic formatting in addition to inserting the typed
character. As a general rule, electric commands are only electric when
the following conditions apply:
* Auto-newline minor mode is enabled, as evidenced by a `C/a' or
`C/ah' indicator on the modeline.
* The character was not typed inside of a literal (1).
* No numeric argument was supplied to the command (i.e. it was typed
as normal, with no `C-u' prefix).
macro definition. These constructs are also known as "syntactic
whitespace" since they are usually ignored when scanning C code.