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48601/0003: docs: functions -M: Add a subheading and index entries.

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Daniel Shahaf 2021-04-16 18:03:45 +00:00
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Doc/Zsh/builtins.yo
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@ -893,6 +893,10 @@ without affecting the other. A typical idiom is that var(oldfn) is the
name of a library shell function which is then redefined to call
tt(newfn), thereby installing a modified version of the function.
em(The )tt(-M)em( and )tt(+M)em( flags)
cindex(defining mathematical functions)
cindex(functions, defining mathematical)
Use of the tt(-M) option may not be combined with any of the options
handled by tt(typeset -f).
@ -929,6 +933,8 @@ Therefore, care must be taken not to use syntactical constructs that perform
arithmetic evaluation after evaluating what is to be the result of the function.
For example:
findex(zmath_cube)
findex(cube)
example(# WRONG
zmath_cube+LPAR()+RPAR() {
(( $1 * $1 * $1 ))