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1) There is a bug when using allow-specializers. (#49: #49) 2) Constancy is a semantic rather than syntactic consideration. There is no way for the programmer to provide an environment, and adding an interface to do so would be another complication. Without the environment, Alexandria doesn't know whether symbols are constant in the environment the parsed code will be used in. 3) Many uses of parsed lambda lists involve constancy checks anyway, e.g. if the variables are bound with LET most implementations will check.