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Richard Smith 4b69264cb1 Add implied return; at end of non-value-returning functions. (#2942) 
Add validation that every code block in a function is terminated by a sequence of terminating instructions, and that terminators don't appear anywhere else in code blocks.

This required tracking whether we're in a reachable code block. That's done on the fly when we create a new code block; the new `SemanticsNodeBlockId::Unreachable` is used to represent the case where we're not actually creating a code block because we're in unreachable code.
2023-06-26 15:17:47 -07:00
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call
Add implied return; at end of non-value-returning functions. (#2942)
2023-06-26 15:17:47 -07:00
definition
Add implied return; at end of non-value-returning functions. (#2942)
2023-06-26 15:17:47 -07:00