[Issue 16287] New: update mixin template specs to reflect new import rules (as of 2.071)

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16287

          Issue ID: 16287
           Summary: update mixin template specs to reflect new import
                    rules (as of 2.071)
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dlang.org
          Assignee: nobody at puremagic.com
          Reporter: 2krnk at gmx.net

mixin template specs https://dlang.org/spec/template-mixin.html currently say:
"A TemplateMixin takes an arbitrary set of declarations from the body of a
TemplateDeclaration and inserts them into the current context."

as import declarations are declarations as well, this would make them available
to the current scope. indeed, this used to be the case until DMD 2.071, when
walter declared this behavior to be invalid:
https://issues.dlang.org/show_bug.cgi?id=15925#c5

now the documentation needs to be changed to explain that 
a) whole module imports (from the mixed in template) will not be visible in the
current scope
b) selective imports, however, will be visible in the current scope

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