Consequently it shouldn't work if the import() is called in the same package, right? (Untested)

Yep, looks like it:

$ perl -wle '{ package Foo; sub import { *{caller."::readpipe"}
  = sub {"Foo"} } } BEGIN { Foo->import() } print `xyz`'
Foo

$ perl -wle 'sub import { *{caller."::readpipe"} = sub {"Foo"} }
  BEGIN { main->import() } print `xyz`'
Can't exec "xyz": No such file or directory at -e line 2.

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In reply to Re^3: Overriding built-in function works only via import()? by haukex
in thread Overriding built-in function works only via import()? by perlancar

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