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dead_code doesn't recognize use as an enum discriminant value #10993

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@sfackler

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@sfackler

This program

static FOO: uint = 10;
pub enum Thing {
    Foo = FOO
}

throws a dead_code warning, but shouldn't:

test.rs:1:0: 1:22 warning: code is never used: `FOO`, #[warn(dead_code)] on by default
test.rs:1 static FOO: uint = 10;
          ^~~~~~~~~~~~~~~~~~~~~~

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