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incorrect pattern match #15129

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@dwrensha

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@dwrensha

I observe the following behavior at 575710f

I expect the below program to fail to typecheck. It succeeds, however, and prints bogus output.

pub enum T {
    T1(()),
    T2(())
}

pub enum V {
    V1(int),
    V2(bool)
}

fn foo (x : (T, V)) {
    match x {
        (T1(()), V1(i))  => println!("T1(()), V1({})", i),
        (T2(()), V2(b))  => println!("T2(()), V2({})", b),

        // _ => ()
        // We need to handle the T1,V2 and T2,V1 cases, but if we add
        // the wildcard here, we get an "unreachable pattern" error.

    }
}


fn main () {

    foo((T1(()), V2(true)));
    // prints "T1(()), V1(0)"

    foo((T2(()), V1(99)));
    // prints "T2(()), V2(false)"
}

This is perhaps related to recent changes by @jakub- ?

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