Not possible to unittest package symbol outside of package

[dlangBugzillaToGithub]

Jacob Carlborg (@jacob-carlborg) reported this on 2017-12-27T13:51:58Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=18131

Description

If a symbol is declared with "package" it's not possible to access it inside a unittest block if the module is not inside a package. Example:

$ cat foo.d
package void bar() {}

unittest
{
    bar();
}

$ dmd -unittest foo.d
foo.d(5): Error: function foo.bar is not accessible from module foo