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use std::result; use thiserror::Error; /// A result from the filecheck library. pub type Result<T> = result::Result<T, Error>; /// A filecheck error. #[derive(Error, Debug)] pub enum Error { /// A syntax error in a check line. #[error("{0}")] Syntax(String), /// A check refers to an undefined variable. /// /// The pattern contains `$foo` where the `foo` variable has not yet been defined. /// Use `$$` to match a literal dollar sign. #[error("{0}")] UndefVariable(String), /// A pattern contains a back-reference to a variable that was defined in the same pattern. /// /// For example, `check: Hello $(world=.*) $world`. Backreferences are not supported. Often the /// desired effect can be achieved with the `sameln` check: /// /// ```text /// check: Hello $(world=[^ ]*) /// sameln: $world /// ``` #[error("{0}")] Backref(String), /// A pattern contains multiple definitions of the same variable. #[error("{0}")] DuplicateDef(String), /// An error in a regular expression. /// /// Use `cause()` to get the underlying `Regex` library error. #[error("{0}")] Regex(#[from] regex::Error), }