trouble creating operators

#what's going on here?

CREATE OPERATOR & (
leftarg = int4,
rightarg = int4,
procedure = int4bitwise_and,
comutator = &
);
CREATE

#so far, so good...

CREATE OPERATOR | (
leftarg = int4,
rightarg = int4,
procedure = int4bitwise_or,
comutator = |
);
ERROR: parser: parse error at or near "|"

#doesn't like pipes?

CREATE OPERATOR ~ (
rightarg = int4,
procedure = int4bitwise_not
);
ERROR: OperatorDef: operator "~" already defined

#on int4?could have fooled me!

DROP OPERATOR ~(none,int4);
ERROR: RemoveOperator: left unary operator '~' taking 'int4' does not exist

#...just as i thought!

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