Hi,
R5RS "4.1.2 Literal expressions" says: As noted in section 3.4, it is an error to alter a constant (i.e. the value of a literal expression) using a mutation procedure like set-car! or string-set!. I test the expression (set-car! '(1 2 3) 4) is ok in several implementations include DrScheme. I think '(1 2 3) here is a literal expression, why it can be changed? Thanks Dustin Zheng
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