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Utilities to build objects from the repr crate for unit testing.

These test utilities are relied by crates other than repr.


Convert a Datum to a String such that test_spec_to_row can convert the String back into a row containing the same Datum.
If the stream starts with a sequence of tokens that can be parsed as a datum, return those tokens as one string.
Parses ScalarType from scalar_type_stream or infers it from litval
Parse a token as a vec of strings that can be parsed as datums in a row.
Constructs a Row from a sequence of litval and littyp.