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    <p>It seems to me that the original question is a bit of a non-sequitor. If the specification explicitly allows a particular behavior (as MUST, MAY, SHALL or SHOULD) then anything compiler/interpreter that allows/implements the behavior is, by definition, compliant with the language. This would seem to be the situation proposed by the OP in the comments section - the JavaScript specification supposedly* says that the function in question MAY be used in different situations, and thus it is explicitly allowed.</p> <p>If, on the other hand, a compiler/interpreter implements or allows behavior that is expressly forbidden by a specification, then the compiler/interpreter is, by definition, operating outside the specification.</p> <p>There is yet a third scenario, and an associated, well defined, term for those situations where the specification does not define a behavior: undefined. If the specification does not actually specify a behavior given a particular situation, then the behavior is undefined, and may be handled either intentionally or unintentionally by the compiler/interpreter. It is then the responsibility of the developer to realize that the behavior is not part of the specification, and, should s/he choose to leverage the behavior, the developer's application is thereby dependent upon the particular implementation. The interpreter/compiler providing that implementation is under no obligation to maintain the officially undefined behavior beyond backwards compatibility and whatever commitments the producer may make. Furthermore, a later iteration of the language specification may define the previously undefined behavior, making the compiler/interpreter either (a) non-compliant with the new iteration, or (b) come out with a new patch/version to become compliant, thereby breaking older versions.</p> <p>* "supposedly" because I have not seen the spec, myself. I go by the statements made, above.</p>
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    1. POWriting programs in dynamic languages that go beyond what the specification allows
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    1. COThe OP did not mention Java.
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    2. COIn Java, code cannot be in an interface. But, using AspectJ I often put code into interfaces, which violates the spec, but this is due to the flexibility of Java and not to a weakness in the specification or compiler, as the writers didn't predict AOP, so the tool was bent to support AOP.
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      1. USJames Black
    3. CO@Nosredna: Apologies for the typo - he said "JavaScript" not "Java". I'll correct my answer, momentarially.
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