Re: Overriding built-in function works only via import()?

With warnings enabled, the second code gives me:

17:01 >perl -we "package Foo; sub readpipe { die }; package main; BEGI
+N { my $rp = qq[main::readpipe]; *{ $rp } = \&Foo::readpipe; } print 
+readpipe('ls')"
Ambiguous call resolved as CORE::readpipe(), qualify as such or use & 
+at -e line 1.
1801_SoPW.pl
1802_SoPW.pl
1803_CUfP
...
[download]

I don’t understand why the compiler sees the call as ambiguous; but following the advice in the warning and prepending an ampersand to the readpipe function does give the desired result:

17:01 >perl -we "package Foo; sub readpipe { die }; package main; BEGI
+N { my $rp = qq[main::readpipe]; *{ $rp } = \&Foo::readpipe; } print 
+&readpipe('ls')"
Died at -e line 1.

17:04 >
[download]

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

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Re^2: Overriding built-in function works only via import()? by perlancar (Hermit) on Feb 01, 2018 at 09:18 UTC
Having to use ampersand in the "target code" removes the attraction to do this in the first place :)	[reply]