Good resources on programming language design? [closed]

Answer 1

You could check out the design documents of  Perl6

Perl6 Synopsis

If you read Synopsis 6, you will find out that the addition operator is named:

• infix:<+>
• infix:«+»
• infix:<<+>>
• infix:{'+'}
• infix:{"+"}

Which means you can create your own operators:

sub postfix: ($n) { [*] 1..$n }