'func' is now an alias for 'proc .noSideEffect'

changelog.md

@@ -35,6 +35,7 @@
 
 - Dot calls combined with explicit generic instantiations can now be written
   as ``x.y[:z]``. ``x.y[:z]`` that is transformed into ``y[z](x)`` in the parser.
+- ``func`` is now an alias for ``proc {.noSideEffect.}``.
 
 ### Language changes
 
@@ -43,7 +44,7 @@
   the use of `static[T]` types.
   (#6415)
 
-- Native C++ exceptions can now be imported with `importcpp` pragma. 
+- Native C++ exceptions can now be imported with `importcpp` pragma.
   Imported exceptions can be raised and caught just like Nim exceptions.
   More details in language manual.