* [9fans] acid - append to empty list
@ 2007-01-11 17:55 Philip Dye
2007-01-11 19:16 ` Russ Cox
0 siblings, 1 reply; 2+ messages in thread
From: Philip Dye @ 2007-01-11 17:55 UTC (permalink / raw)
To: 9fans
Why does an append to a list variable with no elements not assign the
resulting list to the variable ?
acid: l={}
acid: append l, 1
{0x00000001}
acid: l
acid: l={1}
acid: append l, 1
{0x00000001, 0x00000001}
acid: l
{0x00000001, 0x00000001}
acid:
Thanks,
Philip Dye
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [9fans] acid - append to empty list
2007-01-11 17:55 [9fans] acid - append to empty list Philip Dye
@ 2007-01-11 19:16 ` Russ Cox
0 siblings, 0 replies; 2+ messages in thread
From: Russ Cox @ 2007-01-11 19:16 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs, philip.dye
> Why does an append to a list variable with no elements not assign the
> resulting list to the variable ?
It is a failure of vision on Phil's part.
It is difficult to fix but easy to work around:
always write l = append l, 1;
Russ
^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-01-11 17:55 [9fans] acid - append to empty list Philip Dye
2007-01-11 19:16 ` Russ Cox
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