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Report the objec type better in parser error messages.
Make error messages potentially localizable (by making them use sprintf-style strings rather than variable subtitution).
Now that the uverloaded operators handle subclassing properly, we can use promotePrecedence in the compare routines, just in case we define a subclass with even HIGHER precedence!
Handle error messages better. Produce an error if the student answer is a constant vector. Prevent reduction of some negatives in order to avoid -(a+bt). Allow students to provide answer in terms of points rather than vectors.
This file defines a ParametricLine class that provides an answser checker for lines in any dimension given parametrically. The answer checker will recognize the line even if the point and direction vector used by the student are not the same as the ones used by the professor. See the comments within the file for examples of how to use it.
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