support (nongenerative uid) in define-ftype#1015
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A `(nongenerative uid)` clause in `define-ftype` is analogous to the same kind of clause in `define-record-type`. To prevent mismatched definitions using the same `uid`, the check for interned record types needs to compare "extras" --- fields that are added to the record type itself. Previously, "extras" were just assumed to be the same, since they were only generated internally. Also, correct some information in the documentation about the generativity of `define-ftype`. When the right-hand side is an existing ftype name, the definition is not syntactically generative. In those case, `(nongenerative uid)` is disllowed. The `(& <ftype-name> <ftype-name>)` form for a foreign procedure or callable now allows any pointer ftype as the second <ftype-name>, instead of allowing only `ftype-pointer` or `ftype-scheme-object-pointer`. The internal implementation of `ftype-pointer` and `ftype-scheme-object-pointer has been cleaned up to allow these extensions. Relatedly, enable cp0 to reduce `ftype-pointer-address` of `ftype-&ref` of a null pointer to a constant offset.
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A
(nongenerative uid)clause indefine-ftypeis analogous to the same kind of clause indefine-record-type.To prevent mismatched definitions using the same
uidthe check for interned record types needs to compare "extras" —fields that are added to the record type itself. Previously, "extras" were just assumed to be the same, since they were only generated internally.Also, correct some information in the documentation about the generativity of
define-ftype. When the right-hand side is an existing ftype name, the definition is not syntactically generative. In those case,(nongenerative uid)is disllowed.