Reflective call for Primitive + String fails with NoSuchMethodException

[sjrd]

In the following snippet, all asserts fail:

def concat(x: Any { def +(y: String): String }, y: String): String = x + y

assertEquals("Afoo", concat('A', "foo"))
assertEquals("5foo", concat(5.toByte, "foo"))
assertEquals("5foo", concat(5.toShort, "foo"))
assertEquals("5foo", concat(5, "foo"))
assertEquals("5foo", concat(5L, "foo"))
assertEquals("5.5foo", concat(5.5f, "foo"))
assertEquals("5.5foo", concat(5.5, "foo"))

Example error:

java.lang.NoSuchMethodException: java.lang.Integer.$plus(java.lang.String)
  at java.lang.Class.getMethod(Class.java:1786)
  at .reflMethod$Method1(<console>:10)
  at .concat(<console>:10)

Note that def +(s: String) is defined directly on the primitive classes (e.g., Int) and is supposed to be a primitive. This is not the case for Boolean and Unit, which receive their +(String) method from any2stringAdd, like any other class.

I always wondered why char/numeric primitive types had def +(s: String) defined directly. Probably the easiest fix is to just remove those definitions.