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:
Combined from primary sources listed below.

In Operators§

See primary documentation in context for infix :

Used as an argument separator just like infix , and marks the argument to its left as the invocant. That turns what would otherwise be a function call into a method call.

substr('abc': 1);       # same as 'abc'.substr(1)

Infix : is only allowed after the first argument of a non-method call. In other positions, it's a syntax error.