[Issue 20404] New: Can't disambiguate function calls made ambiguous by "import std"

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20404

          Issue ID: 20404
           Summary: Can't disambiguate function calls made ambiguous by
                    "import std"
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: mipri at minimaltype.com

This complete program

import std;
void main() {
    writeln(isGraphical(' '));
}

properly fails to compile with this error:

Error: std.uni.isGraphical at /usr/include/dmd/phobos/std/uni.d(10350)
conflicts with std.ascii.isGraphical at
/usr/include/dmd/phobos/std/ascii.d(461)

This correction of it also fails, however:

import std;
void main() {
    writeln(std.ascii.isGraphical(' '));
}
// Error: undefined identifier ascii in module std

Whereas a version that simply doesn't use "import std" doesn't exhibit the
second failure:

import std.ascii;
import std.uni;
import std.stdio;
void main() {
    writeln(std.ascii.isGraphical(' '));
}

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