https://issues.dlang.org/show_bug.cgi?id=19466

          Issue ID: 19466
           Summary: functionLinkage documentation omits some values
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: johnch_atms@hotmail.com

std.traits.functionLinkage wraps __traits(getLinkage,...) but the documentation doesn't list all its values. The full list (from https://dlang.org/spec/traits.html#getLinkage and https://dlang.org/spec/attribute.html#LinkageAttribute) that should appear in the Returns section is: "D", "C", "C++", "Windows", "Pascal", "Objective-C" and "System".

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