Update conditional expression section of IDA#4472
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RikkiGibson merged 8 commits intodotnet:masterfrom Mar 1, 2021
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Mar 1, 2021
| This handles the `dict?.TryGetValue(key, out var value) ?? false` scenario, by taking the resulting state of a "hypothetical" `dict.TryGetValue(key, out var value)` call and using it as the resulting state-when-true of the `dict?.TryGetValue(key, out var value) ?? false` expression. | ||
| The above rule formalizes that for an expression like `a?.M(out x) ?? (x = false)`, either the `a?.M(out x)` was fully evaluated and produced a non-null value, in which case `x` was assigned, or the `x = false` was evaluated, in which case `x` was also assigned. Therefore `x` is always assigned after this expression. | ||
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| This also handles the `dict?.TryGetValue(key, out var value) ?? false` scenario, by observing that *v* is definitely assigned after `dict.TryGetValue(key, out var value)`, and *v* is "definitely assigned when true" after `false`, and concluding that *v* must be "definitely assigned when true". |
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Builds on #4468