Running the following program in DrRacket 5.1.1 highlights the `error'
expression if debugging is enabled:

#lang racket

(syntax-case 'a ()
  (_ (error 'boom)))

Running the same program in 4d7584d/g doesn't highlight anything.

Without the `syntax-case' around it, both versions highlight the
`error' expression.

Is this a bug? If not, is there a reliable way to associate a source
location with a runtime error?
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