dylan-environment display command does not work

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The display command in the command-line environment is not able to parse its argument:

No applicable method, applying {<incremental-generic-function>: parse-next-argument} to {<simple-object-vector>: {<environment-context-implementation>}, {<class>: <application-object>}, ":display simple-breakpoint", #"start", 9, #"end", 26}.

(The command, intended to display raw memory in the debugged process, is probably not very useful anyway.)