From c15880e6fe79f1d746f47deb22549518f1333c8a Mon Sep 17 00:00:00 2001 From: Gaëtan Gilbert Date: Sun, 20 May 2018 21:21:43 +0200 Subject: Existing Class noop when already a class + warning. Fix #5012. --- doc/sphinx/addendum/type-classes.rst | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'doc') diff --git a/doc/sphinx/addendum/type-classes.rst b/doc/sphinx/addendum/type-classes.rst index 6c7258f9c..68b5b9d6f 100644 --- a/doc/sphinx/addendum/type-classes.rst +++ b/doc/sphinx/addendum/type-classes.rst @@ -296,6 +296,10 @@ Variants: This variant declares a class a posteriori from a constant or inductive definition. No methods or instances are defined. + .. warn:: @ident is already declared as a typeclass + + This command has no effect when used on a typeclass. + .. cmd:: Instance @ident {? @binders} : Class t1 … tn [| priority] := { field1 := b1 ; …; fieldi := bi } The :cmd:`Instance` command is used to declare a type class instance named -- cgit v1.2.3