Excerpt from Type Determination for Very High Level Languages
In many very high level languages, identifiers are not constrained to refer to objects of particular type. Also, in order to make maximum use of a small syntactic space, the meaning of operator symbols may depend on the types of their operands. In the setl language (schwartz 1973 a, h), for example, the plus sign represents addition for numeric operands, concatenation for tuples, c...
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