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debug safety feature: runtime undefined value detection #211
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acceptedThis proposal is planned.This proposal is planned.frontendTokenization, parsing, AstGen, Sema, and Liveness.Tokenization, parsing, AstGen, Sema, and Liveness.proposalThis issue suggests language modifications. If it also has the "accepted" label then it is planned.This issue suggests language modifications. If it also has the "accepted" label then it is planned.
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acceptedThis proposal is planned.This proposal is planned.frontendTokenization, parsing, AstGen, Sema, and Liveness.Tokenization, parsing, AstGen, Sema, and Liveness.proposalThis issue suggests language modifications. If it also has the "accepted" label then it is planned.This issue suggests language modifications. If it also has the "accepted" label then it is planned.
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If the programmer initializes a variable to undefined or otherwise sets the value to undefined anywhere, we can secretly make the type of the variable a maybe type and have a bit to keep track of whether it is undefined at any given point in time. Then if the programmer tries to use a value which is undefined, we detect it with a runtime check, and crash with a stack trace.