晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Thu Feb 12 08:51:22 IST 2015
============================
This file documents several things related to the 2008 POSIX standard
that I noted after reviewing it.

1. POSIX leaves undefined what happens for something like

	awk '{ print ; exit }' if=42 /etc/passwd

   Mawk diagnoses this.  Gawk and BWK awk do not. This doesn't seem to be
   worth the effort to add the code, but at least I'm aware of it.

2. The 2001-2004 standards accidentally required support for hexadecimal
   floating point constants and for Infinity and Not-A-Number (NaN) values.

   The 2008 standard now explicitly allows, but does not require, such
   support.

   More discussion is provided in the node `POSIX Floating Point Problems'
   in gawk.texi.

3. String comparison with <, <= etc is supposed to take the locale's collating
   sequence into account.  By default gawk doesn't do this. Rather, gawk
   will do this only if --posix is in effect.

4. According to POSIX, the function parameters of one function may not have
   the same name as another function, making this invalid:

	function foo() { ... }
	function bar(foo) { ...}

   Or even:

	function bar(foo) { ...}
	function foo() { ... }

   Gawk enforces this only with --posix.

The following things aren't described by POSIX but ought to be:

1. The value of $0 in an END rule

2. The return value of a function that either does return with no value
   or that falls off the end of the function body.

3. What happens with substr() if start is <= 0, or greater than the length
   of the string, or if length is <= 0.

4. Whether "next" can be invoked from a function body.

haha - 2025