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A single-semicolon until the end of the line, i.e.
; this is a comment.
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Most code now relies on the pattern matcher rather than this function,
and for the only remaining case, not using this saves an iteration.
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Previously, the IR reader was riddled with code that:
1. Checked for the right number of list elements (via a linked list walk)
2. Retrieved references to each component (via ->next->next pointers)
3. Downcasted as necessary to make sure that each sub-component was the
right type (i.e. symbol, int, list).
4. Checking that the tag (i.e. "declare") was correct.
This was all very ad-hoc and a bit ugly. Error checking had to be done
at both steps 1, 3, and 4. Most code didn't even check the tag, relying
on the caller to do so. Not all callers did.
The new pattern matching module performs the whole process in a single
straightforward function call, resulting in shorter, more readable code.
Unfortunately, MSVC does not support C99-style anonymous arrays, so the
pattern must be declared outside of the match call.
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We always want to use '.' as the decimal point.
See http://bugs.freedesktop.org/show_bug.cgi?id=24531
NOTE: this is a candidate for the 7.10 branch.
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We really only want to print spaces -between- elements, not after each
element. This cleans up error messages from IR reader, making them
(mildly) easier to read.
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This seems to give roughly a 20% speedup.
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