[Issue 21920] New: [REG master] Error: `auto` can only be used as part of `auto ref` for template function parameters

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21920

          Issue ID: 21920
           Summary: [REG master] Error: `auto` can only be used as part of
                    `auto ref` for template function parameters
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

import std.stdio;
void function(string) printer = &writeln!string;

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Caused by https://github.com/dlang/phobos/pull/8055

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