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Russ Cox 0db9518ab3 fmt: document and adjust Scanf space handling to eliminate a few paradoxes
This CL makes minor adjustment to the handling of spaces and newlines
and then documents the result.

The semantic adjustment mainly concerns the handling of a run of
spaces following a newline in the format, like in "\n ".
Previously, that run of spaces was ignored entirely, leading to paradoxes
like the format "1 \n 2" not matching itself as input.
Now, spaces following a newline in the format match zero or more
spaces following the corresponding newline in the input.

The changes to the test suite show how minor the semantic adjustments are
and how they make the behavior more regular than previously.

This CL also updates the documentation to explain the handling of
spaces more precisely, incorporating the draft from CL 17723 but
describing the newly introduced behavior.

Fixes #13565.

Change-Id: I129666e9ba42de3c28b67f75cb47488e9a4c1867
Reviewed-on: https://go-review.googlesource.com/30611
Reviewed-by: Rob Pike <r@golang.org>
2016-10-07 03:46:50 +00:00
.github
api
doc spec: clarify acceptable indices in array/slice composite literals 2016-10-06 20:37:39 +00:00
lib/time
misc
src fmt: document and adjust Scanf space handling to eliminate a few paradoxes 2016-10-07 03:46:50 +00:00
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