provide an implicit that indicates the absence of a static txn context about ccstm HOT 5 CLOSED

Initial evaluation in ec14e63

See MaybeTxnSuite for several prototypes of the described static/dynamic hybrid lookup. The dynamic lookup costs about 10 nanoseconds on my laptop with either a 32 or 64 bit server VM. (static vs. dyn-delegating)

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As an alternative to an implicit object TxnUnknown extends MaybeTxn, a default value could be used

STM.atomic[Z](f: Txn => Z)(implicit ctx: MaybeTxn = TxnUnknown)

This might have less implicit priority issues, but is more verbose for user-specified Context-threading methods.

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Should this be a three-way thing, where we add an atomic-like escaped operation that introduces a DefinitelyNoTxn implicit that bypasses the dynamic check?

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API merged into master at b074e59

Issue remains open pending unit tests

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Fixed in 6710b13

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