Depends on a language. Perl for example is extremely difficult for an editor to get right, especially if you use OO framework other than Moose. On the other h

Depends on a language. Perl for example is extremely difficult for an editor to get right, especially if you use OO framework other than Moose. On the other hand, as others pointed out, where is the line between an IDE and a sufficiently customized editor using language server?