[Issue 19493] New: compiler crash when trying to format invalid contracts

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19493

          Issue ID: 19493
           Summary: compiler crash when trying to format invalid contracts
           Product: D
           Version: D2
          Hardware: All
               URL: http://dlang.org/
                OS: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: b2.temp at gmx.com

When DMD tries to format errors for

    type of function function in

or

   type of function function out

it crashes due to unsafe access to null AST nodes.

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