Richard Leach b625025e93 Prefer scalar assignment to get caller's first return value ...

Multiple forms of syntax can be used to obtain a package name from
`caller`, which emits this as its first return value, and assign
that name to a lexical scalar.

The following each achieve the same result, but with varying efficiency:
* `sub callme { my $package = caller(2); ...}`
* `sub callme { my ($package) = caller(2); ...}`
* `sub callme { my $package = (caller(2))[0]; ...}`

In the first example, `pp_caller` determines only the package name
and pushes it to the stack. In the other two examples, the other 10 of
`caller`'s return values are calculated and pushed onto the stack,
before being discarded.

This commit changes non-CPAN-first instances of the latter two forms
in core to the first form.

Note: There is a special exception to the equivalence described above,
when caller is use in list context within the DB package. Such a
usage instance in regen/warnings.pl therefore remains unchanged.

2023-02-22 12:58:26 +01:00

..

Struct.pm

Prefer scalar assignment to get caller's first return value

2023-02-22 12:58:26 +01:00

Struct.t

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