# guards

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This module implements the 'implies' relation for guards.

# Imports

ast, astalgo, msgs, magicsys, nimsets, trees, types, renderer, idents, saturate, modulegraphs, options, lineinfos, int128

# Types

    TModel = object
      s*: seq[PNode]
      g*: ModuleGraph
      beSmart*: bool

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# Procs

    proc addAsgnFact(m: var TModel; key, value: PNode) {....raises: [], tags: [],
        forbids: [].}

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    proc addCaseBranchFacts(m: var TModel; n: PNode; i: int) {.
        ...raises: [ERecoverableError], tags: [], forbids: [].}

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    proc addDiscriminantFact(m: var TModel; n: PNode) {....raises: [], tags: [],
        forbids: [].}

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    proc addFact(m: var TModel; nn: PNode) {....raises: [ERecoverableError, KeyError],
        tags: [], forbids: [].}

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    proc addFactLe(m: var TModel; a, b: PNode) {....raises: [KeyError], tags: [],
        forbids: [].}

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    proc addFactLt(m: var TModel; a, b: PNode) {....raises: [KeyError], tags: [],
        forbids: [].}

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    proc addFactNeg(m: var TModel; n: PNode) {.
        ...raises: [ERecoverableError, KeyError], tags: [], forbids: [].}

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    proc buildAdd(a: PNode; b: BiggestInt; o: Operators): PNode {.
        ...raises: [KeyError], tags: [], forbids: [].}

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    proc buildCall(op: PSym; a, b: PNode): PNode {....raises: [], tags: [], forbids: [].}

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    proc buildCall(op: PSym; a: PNode): PNode {....raises: [], tags: [], forbids: [].}

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    proc buildLe(o: Operators; a, b: PNode): PNode {....raises: [], tags: [],
        forbids: [].}

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    proc canon(n: PNode; o: Operators): PNode {....raises: [KeyError], tags: [],
        forbids: [].}

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    proc checkFieldAccess(m: TModel; n: PNode; conf: ConfigRef; produceError: bool) {.
        ...raises: [KeyError, ERecoverableError, Exception, ValueError, IOError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc doesImply(facts: TModel; prop: PNode): TImplication {.
        ...raises: [ERecoverableError, KeyError, Exception, ValueError, IOError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc highBound(conf: ConfigRef; x: PNode; o: Operators): PNode {.
        ...raises: [Exception, ValueError, KeyError, IOError, ERecoverableError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc impliesNotNil(m: TModel; arg: PNode): TImplication {.
        ...raises: [ERecoverableError, KeyError, Exception, ValueError, IOError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc interestingCaseExpr(m: PNode): bool {....raises: [], tags: [], forbids: [].}

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    proc invalidateFacts(m: var TModel; n: PNode) {....raises: [], tags: [],
        forbids: [].}

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    proc invalidateFacts(s: var seq[PNode]; n: PNode) {....raises: [], tags: [],
        forbids: [].}

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    proc lowBound(conf: ConfigRef; x: PNode): PNode {.
        ...raises: [Exception, ValueError, KeyError, IOError, ERecoverableError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc proveLe(m: TModel; a, b: PNode): TImplication {.
        ...raises: [KeyError, ERecoverableError, Exception, ValueError, IOError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc sameSubexprs(m: TModel; a, b: PNode): bool {.
        ...raises: [ERecoverableError, KeyError, Exception, ValueError, IOError], tags: [
        RootEffect, ReadDirEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect],
        forbids: [].}

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    proc sameTree(a, b: PNode): bool {....raises: [], tags: [], forbids: [].}

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    proc simpleSlice(a, b: PNode): BiggestInt {....raises: [], tags: [], forbids: [].}

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