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37831: typeset: Document exit status difference from parameter assignment statements

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Daniel Shahaf 2016-01-29 09:18:34 +00:00
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@ -1,3 +1,8 @@
2016-01-30 Daniel Shahaf <d.s@daniel.shahaf.name>
* 37831: Doc/Zsh/builtins.yo: typeset: Document exit status
difference from parameter assignment statements
2016-01-30 Jun-ichi Takimoto <takimoto-j@kba.biglobe.ne.jp>
* 37838: Src/Builtins/rlimits.c, Src/Builtins/sched.c,

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Doc/Zsh/builtins.yo
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@ -1826,6 +1826,23 @@ reserved word interface for tt(typeset) may cause problems with the
output of `tt(typeset -p)', which assumes the reserved word interface is
available in order to restore array and associative array values.
Unlike parameter assignment statements, tt(typeset)'s exit status on an
assignment that involves a command substitution does not reflect the exit
status of the command substitution. Therefore, to test for an error in
a command substitution, separate the declaration of the parameter from its
initialization:
example(# WRONG
typeset var1=$(exit 1) || echo "Trouble with var1"
# RIGHT
typeset var1 && var1=$(exit 1) || echo "Trouble with var1"
)
To initialize a parameter var(param) to a command output and mark it readonly,
use tt(typeset -r )var(param) or tt(readonly )var(param) after the parameter
assignment statement.
If the shell option tt(TYPESET_SILENT) is not set, for each remaining
var(name) that refers to a parameter that is already set, the name and
value of the parameter are printed in the form of an assignment.