Why do my stack traces look like this? How can I get more informative ones?

[pineapple via Digitalmars-d-learn]

On Sunday, 10 April 2016 at 00:48:23 UTC, pineapple wrote:
> How can I fix this, and get something human-readable?

Oh, answered my own question. Appending the -g flag to dmd 
options makes the stack trace much prettier.