# compiler/nilcheck

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# Imports

ast, renderer, msgs, options, lineinfos, idents, treetab

# Types

    Nilability = enum
      Parent, Safe, MaybeNil, Nil, Unreachable

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# Procs

    func `$`(a: ExprIndex): string {....raises: [], tags: [].}

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    func `$`(a: SetIndex): string {....raises: [], tags: [].}

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    func `+`(a: ExprIndex; b: ExprIndex): ExprIndex {....raises: [], tags: [].}

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    func `+`(a: SetIndex; b: SetIndex): SetIndex {....raises: [], tags: [].}

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    func `-`(a: ExprIndex; b: ExprIndex): ExprIndex {....raises: [], tags: [].}

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    func `-`(a: SetIndex; b: SetIndex): SetIndex {....raises: [], tags: [].}

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    func `<=`(a: ExprIndex; b: ExprIndex): bool {....raises: [], tags: [].}

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    func `<`(a: ExprIndex; b: ExprIndex): bool {....raises: [], tags: [].}

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    func `==`(a: ExprIndex; b: ExprIndex): bool {....raises: [], tags: [].}

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    func `==`(a: SetIndex; b: SetIndex): bool {....raises: [], tags: [].}

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    func `>=`(a: ExprIndex; b: ExprIndex): bool {....raises: [], tags: [].}

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    func `>`(a: ExprIndex; b: ExprIndex): bool {....raises: [], tags: [].}

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    proc add[T, U](a: var SeqOfDistinct[T, U]; value: U)

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    proc checkNil(s: PSym; body: PNode; conf: ConfigRef; idgen: IdGenerator) {....raises: [
        KeyError, Exception, ValueError, OSError, IOError, ERecoverableError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

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