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Diffstat (limited to 'doc/sphinx/language/core')
| -rw-r--r-- | doc/sphinx/language/core/variants.rst | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/doc/sphinx/language/core/variants.rst b/doc/sphinx/language/core/variants.rst new file mode 100644 index 0000000000..ff4212bdd4 --- /dev/null +++ b/doc/sphinx/language/core/variants.rst @@ -0,0 +1,23 @@ +Variants +~~~~~~~~ + +.. cmd:: Variant @variant_definition {* with @variant_definition } + + .. insertprodn variant_definition variant_definition + + .. prodn:: + variant_definition ::= @ident_decl {* @binder } {? %| {* @binder } } {? : @type } := {? %| } {+| @constructor } {? @decl_notations } + + The :cmd:`Variant` command is similar to the :cmd:`Inductive` command, except + that it disallows recursive definition of types (for instance, lists cannot + be defined using :cmd:`Variant`). No induction scheme is generated for + this variant, unless the :flag:`Nonrecursive Elimination Schemes` flag is on. + + This command supports the :attr:`universes(polymorphic)`, + :attr:`universes(monomorphic)`, :attr:`universes(template)`, + :attr:`universes(notemplate)`, :attr:`universes(cumulative)`, + :attr:`universes(noncumulative)` and :attr:`private(matching)` + attributes. + + .. exn:: The @num th argument of @ident must be @ident in @type. + :undocumented: |