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f4e051e35d
Previously, breaking from an outer block at comptime would result in incorrect control flow. Now there is a mechanism, `error.ComptimeBreak`, similar to `error.ComptimeReturn`, to send comptime control flow further up the stack, to its matching block. This commit also introduces a new log scope. To use it, pass `--debug-log sema_zir` and you will see 1 line per ZIR instruction semantically analyzed. This is useful when you want to understand what comptime control flow is doing while debugging the compiler. One more `switch` test case is passing.