[Issue 23466] New: -verrors=context should not show context for supplemental messages

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23466

          Issue ID: 23466
           Summary: -verrors=context should not show context for
                    supplemental messages
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: nick at geany.org

Supplemental messages generally have no need to show the source line context.
Below, only the `Error:` lines actually benefit from context:

compiler\test\fail_compilation\diag8101.d:57: Error: function
`diag8101.f_0(int)` is not callable using argument types `()`
    f_0();
       ^
compiler\test\fail_compilation\diag8101.d:57:        too few arguments,
expected `1`, got `0`
    f_0();
       ^
compiler\test\fail_compilation\diag8101.d:58: Error: none of the overloads of
`f_1` are callable using argument types `()`
    f_1();
       ^
compiler\test\fail_compilation\diag8101.d:33:        Candidates are:
`diag8101.f_1(int)`
void f_1(int);
     ^
compiler\test\fail_compilation\diag8101.d:34:                       
`diag8101.f_1(int, int)`
void f_1(int, int);
     ^
compiler\test\fail_compilation\diag8101.d:59: Error: none of the overloads of
`f_2` are callable using argument types `()`
    f_2();
       ^

PR incoming.

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