A literal Tuple2
A list of Tuple2, for example used as a list of key/value pairs (like in a call to applyDynamicNamed).
Extracts the literal strings in "key" position of a sequence of Tuple2.
Extracts the literal strings in "key" position of a sequence of Tuple2.
Non-Tuple2 constructors are silently ignored, as well as non-literal keys.