24     pub fn eval(&self, rustc: Version) -> bool {  in eval()
28             Stable => rustc.channel == Channel::Stable,  in eval()
29             Beta => rustc.channel == Channel::Beta,  in eval()
30             Nightly => match rustc.channel {  in eval()
34             Date(date) => match rustc.channel {  in eval()
35                 Channel::Nightly(rustc) => rustc == *date,  in eval()
38             Since(bound) => rustc >= *bound,  in eval()
39             Before(bound) => rustc < *bound,  in eval()
41                 rustc.channel == Channel::Stable  in eval()
42                     && rustc.minor == release.minor  in eval()
43                     && release.patch.map_or(true, |patch| rustc.patch == patch)  in eval()
45             Not(expr) => !expr.eval(rustc),  in eval()
46             Any(exprs) => exprs.iter().any(|e| e.eval(rustc)),  in eval()
47             All(exprs) => exprs.iter().all(|e| e.eval(rustc)),  in eval()