Add todo and unreachable builtins
#488
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Prelude: adding `todo(message: String)` and `unreachable(message: String)` builtin functions. These functions have the `noreturn` decorator since they call `Process.exit()` after printing a specific message (along with the optional `message` parameter). Compiler: Replace usages of ad-hoc todo/unreachable functions with the new builtin implementations. This requires that the `ABRA_HOME` environment variable be set to the _current_ `std/` dir during tests, as opposed to the `std/` dir packaged with the latest published version.
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Prelude: adding
todo(message: String)andunreachable(message: String)builtin functions. These functions have thenoreturndecorator since they callProcess.exit()after printing a specific message (along with the optionalmessageparameter).Compiler: Replace usages of ad-hoc todo/unreachable functions with the new builtin implementations. This requires that the
ABRA_HOMEenvironment variable be set to the currentstd/dir during tests, as opposed to thestd/dir packaged with the latest published version.