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 | use std::collections::VecDeque;
pub struct BuildPlanBuilder {
    acc: VecDeque<(String, String)>,
    current_provides: String,
    current_requires: String,
}
impl BuildPlanBuilder {
    pub fn or(&mut self) -> &mut Self {
        self.acc.push_back(self.current_provides, self.current_requires);
        //~^ ERROR method takes 1 argument but 2 arguments were supplied
        self
    }
}
fn main() {}
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