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C#: Data flow for positional patterns. - #22689

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C#: Data flow for positional patterns.#22689
michaelnebel wants to merge 12 commits into
github:mainfrom
michaelnebel:csharp/positionalpatternflow

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@michaelnebel michaelnebel commented Sep 28, 2026 •
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In this PR we add data flow support via positional patterns. That is,

var x = (1, (2, 3), 4);
switch (x)
{
    case (var a1, (var b1, var c1), _):
        Sink(a1);        // has value flow 1
        Sink(c1);        // has value flow 3
        Sink(b1);       // has value flow 2.
        break;
}

Note, that positional patterns are similar to tuple patterns (var (x, y)), but they haven't been handled in the data flow library before now.

@michaelnebel michaelnebel changed the title Csharp/positionalpatternflow C#: Data flow for positional patterns. Sep 29, 2026

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