MI -exec-continue "-t" option?

[Grant Edwards]

Recently I dusted off an old program that uses gdb 5.3 in MI mode. 
The program sends gdb the command "-exec-continue -t <startAddress>".

I swear this used to work, but now gdb objects to the "-t", and none
of the documentation I can find for MI mode shows any arguments for
the -exec-continue command.

At some point in the past did the '-exec-continue' command accept an
argument?

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