[isabelle-dev] NEWS: ML antiquotation "instantiate"
Makarius
makarius at sketis.net
Thu Oct 28 22:05:26 CEST 2021
*** ML ***
* ML antiquotation "instantiate" allows to instantiate formal entities
(types, terms, theorems) with values given ML. This works uniformly for
"typ", "term", "prop", "ctyp", "cterm", "cprop", "lemma" --- given as a
keyword after the instantiation. A mode "(schematic)" behind the keyword
means that some variables may remain uninstantiated (fixed in the
specification and schematic in the result); by default, all variables
need to be instantiated.
Examples in HOL:
fun make_assoc_type (A, B) =
\<^instantiate>‹'a = A and 'b = B in typ ‹('a × 'b) list››;
val make_assoc_list =
map (fn (x, y) =>
\<^instantiate>‹'a = ‹fastype_of x› and 'b = ‹fastype_of y› and
x and y in term ‹(x, y)› for x :: 'a and y :: 'b›);
fun symmetry x y =
\<^instantiate>‹'a = ‹Thm.ctyp_of_cterm x› and x and y in
lemma ‹x = y ⟹ y = x› for x y :: 'a by simp›
fun symmetry_schematic A =
\<^instantiate>‹'a = A in
lemma (schematic) ‹x = y ⟹ y = x› for x y :: 'a by simp›
This refers to Isabelle/54085e37ce4d. Some applications are in the preceeding
changesets.
Proper documentation will follow shortly after Isabelle2021-1-RC1 (start of
next week).
Makarius
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