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documentation improvement; make mixin easier to search (#6409)

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jlp765 2017-09-21 17:48:49 +10:00 • committed by Andreas Rumpf
commit dabe4aed86
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6
doc/manual/generics.txt
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@ -633,6 +633,9 @@ the ``vtptr`` magic produced types bound to ``ptr`` types.
Symbol lookup in generics
-------------------------
Open and Closed symbols
~~~~~~~~~~~~~~~~~~~~~~~
The symbol binding rules in generics are slightly subtle: There are "open" and
"closed" symbols. A "closed" symbol cannot be re-bound in the instantiation
context, an "open" symbol can. Per default overloaded symbols are open
@ -658,6 +661,9 @@ the ``Index`` type is defined *after* the ``==`` for tuples; yet the example
compiles as the instantiation takes the currently defined symbols into account
too.
Mixin statement
---------------
A symbol can be forced to be open by a `mixin`:idx: declaration:
.. code-block:: nim