Scala Map, ambiguity between tuple and function argument list -

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val m = scala.collection.mutable.map[string, int]() // doesn't work m += ("foo", 2) // work m += (("foo", 2)) // works val barpair = ("bar", 3) m += barpair

so what's deal m += ("foo" , 2) not working? scala gives type error:

 error: type mismatch;  found   : java.lang.string("foo")  required: (string, int)        m += ("foo", 2)              ^

apparently scala thinks trying call += 2 arguments, instead of 1 tuple argument. why? isn't unambiguous, since not using m.+= ?

unfortunately a b (c, d, e, ..) desugars a.b(c, d, e, ..). hence error.


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