24aec16dda
Exception handling SHOULD be possible depending on codegen (and if not, we can make it trap and add a warning when we make that decision), but throwing out of a compute construct is ill formed. This patch adds an error for a 'throw' that isn't in a 'try' scope. This error is imperfect as it won't diagnose a 'throw' that escapes its 'try', or one in a separate function, but it catches the obvious mistakes. The other cases will need to be handled as runtime failures.
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