The standard output is three lines:
A
2.3
B
This is program output, excluding any interactive interpreter's display of returned values. The calls a.m(1) and b.m(5.6) compute squares without printing. In A, the concrete m(Int) wins over the generic method at argument 1; the string and 2.3 use m[T] and print their arguments.
For b: B[Any], the class type parameter has already become Any, so the two alternatives are m(Any) and m(Double), rather than a method with its own freely inferred type parameter. The Double alternative is more specific. It accepts 4 by numeric widening, so b.m(4) computes 16.0 without printing; b.m("B") prints B; b.m(5.6) computes a square without printing. These are applications of the Scala 2.11 method overloading rules, with the arithmetic return values discarded in statement position.[ref]

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