Fix the arguments for std.windows.syserror.wenforce
Parameterize a string type for error message
Add missing std.traits.isSomeString
fix doc
Move prefix member function attributes to postfix
Merge pull request #2585 from 9rnsr/fix12931

Move prefix member function attributes to postfix
Merge pull request #2583 from MartinNowak/doc

fix doc
Merge pull request #2570 from tom-tan/fix-windows-syserror-wenforce

Fix the arguments for std.windows.syserror.wenforce
Implement chunkBy.
Implement binary predicate for chunkBy.
Move std.range.chunkBy to std.algorithm.groupBy.
Refactor to eliminate redundant call to r.empty.

.savePrev and .prev should be private.