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multi-methods need to be explicitly enabled (#10856)

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* multi-methods need to be explicitly enabled

* update changelog, manual and tutorial
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Miran 2019-03-18 08:21:38 +01:00 • committed by Andreas Rumpf
commit afeca3d9fe
8 changed files with 36 additions and 7 deletions
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doc/manual.rst
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@ -3716,6 +3716,9 @@ The ``[]`` subscript operator for arrays/openarrays/sequences can be overloaded.
Multi-methods
=============
**Note:** Starting from Nim 0.20, to use multi-methods one must explicitly pass
``--multimethods:on`` when compiling.
Procedures always use static dispatch. Multi-methods use dynamic
dispatch. For dynamic dispatch to work on an object it should be a reference
type as well.
@ -6222,7 +6225,7 @@ Predicate Meaning
=================== =====================================================
Predicates that share their name with a keyword have to be escaped with
backticks: `` `const` ``.
backticks.
The ``alias`` and ``noalias`` predicates refer not only to the matching AST,
but also to every other bound parameter; syntactically they need to occur after
the ordinary AST predicates: