refactor: rename ErrorShouldCancel (#66)

Author: aleksator

src/error.rs

@@ -68,7 +68,7 @@ pub enum PubGrubError<P: Package, V: Version> {
     /// Error arising when the implementer of [DependencyProvider](crate::solver::DependencyProvider)
     /// returned an error in the method [should_cancel](crate::solver::DependencyProvider::should_cancel).
     #[error("We should cancel")]
-    ErrorShouldCancel(Box<dyn std::error::Error>),
+    ErrorInShouldCancel(Box<dyn std::error::Error>),
 
     /// Something unexpected happened.
     #[error("{0}")]

src/solver.rs

@@ -90,7 +90,7 @@ pub fn resolve<P: Package, V: Version>(
     loop {
         dependency_provider
             .should_cancel()
-            .map_err(|err| PubGrubError::ErrorShouldCancel(err))?;
+            .map_err(|err| PubGrubError::ErrorInShouldCancel(err))?;
 
         state.unit_propagation(next)?;