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user=> (defn foo [_] "foo")
user=> (defprotocol IFoo
(foo [_]))
Warning: protocol #'user/IFoo is overwriting function foo
IFoo
user=> (extend-protocol IFoo nil (foo [_] "IFoo"))
nil
user=> (foo nil)
"IFoo"
user=> (foo 1)
java.lang.IllegalArgumentException: No implementation of metho
user=> (defn foo [_] "foo")
user=> (defprotocol IFoo
(foo [_]))
Warning: protocol #'user/IFoo is overwriting function foo
IFoo
user=> (extend-protocol IFoo nil (foo [_] "IFoo"))
nil
user=> (foo nil)
"IFoo"
user=> (foo 1)
java.lang.IllegalArgumentException: No implementation of meth
