an error --> a wanted feature

[Skaperen]

What is the name of the programming language which can do: x*x = y

it couldn't actually do that ... but the debate was that since * was workable as a function, that is, you defined a function for each operator in type definitions for new programmer defined types, the existing definition of int and float (as we call them in python) should support __multiply__(x,x) = y so that x*x = y would work.  the existing implementations of the base types apparently were not in the language itself, but were part of the language interpreter

i cannot remember the name of the language.  something makes me think it was PCL or CLU.  it could have been ProLog (as micseydel hinted).  it had a discussion mailing list around 1984.  i didn't have access to a working deployment.