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feat: add tests and fix existing ones
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17ff85081d
commit
44c62c9aa2
@ -47,12 +47,12 @@ impl<'tcx> LateLintPass<'tcx> for UseUnwrapOr {
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fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
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// look for x.or().unwrap()
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if_chain! {
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if let ExprKind::MethodCall(path, [unwrap_self], unwrap_span) = expr.kind;
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if let ExprKind::MethodCall(path, [unwrap_self], unwrap_span) = &expr.kind;
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if path.ident.name == sym::unwrap;
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if let ExprKind::MethodCall(caller_path, [or_self, or_arg], or_span) = unwrap_self.kind;
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if let ExprKind::MethodCall(caller_path, [or_self, or_arg], or_span) = &unwrap_self.kind;
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if caller_path.ident.name == sym::or;
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then {
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let ty = cx.typeck_results().expr_ty(&or_self); // get type of x (we later check if it's Option or Result)
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let ty = cx.typeck_results().expr_ty(or_self); // get type of x (we later check if it's Option or Result)
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let title;
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if is_type_diagnostic_item(cx, ty, sym::Option) {
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@ -74,7 +74,7 @@ impl<'tcx> LateLintPass<'tcx> for UseUnwrapOr {
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span_lint_and_help(
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cx,
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USE_UNWRAP_OR,
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or_span.to(unwrap_span),
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or_span.to(*unwrap_span),
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title,
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None,
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"use `unwrap_or()` instead"
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@ -1,4 +1,5 @@
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#![warn(clippy::use_unwrap_or)]
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#![allow(clippy::map_identity)]
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struct SomeStruct {}
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impl SomeStruct {
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@ -8,6 +9,14 @@ impl SomeStruct {
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fn unwrap(&self) {}
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}
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struct SomeOtherStruct {}
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impl SomeOtherStruct {
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fn or(self) -> Self {
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self
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}
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fn unwrap(&self) {}
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}
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fn main() {
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let option: Option<&str> = None;
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let _ = option.or(Some("fallback")).unwrap(); // should trigger lint
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@ -19,6 +28,9 @@ fn main() {
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let instance = SomeStruct {};
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let _ = instance.or(Some(SomeStruct {})).unwrap(); // should not trigger lint
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let instance = SomeOtherStruct {};
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let _ = instance.or().unwrap(); // should not trigger lint and should not panic
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// None in or
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let option: Option<&str> = None;
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let _ = option.or(None).unwrap(); // should not trigger lint
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@ -26,4 +38,8 @@ fn main() {
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// Not Err in or
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let result: Result<&str, &str> = Err("Error");
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let _ = result.or::<&str>(Err("Other Error")).unwrap(); // should not trigger lint
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// other function between
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let option: Option<&str> = None;
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let _ = option.or(Some("fallback")).map(|v| v).unwrap(); // should not trigger lint
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}
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@ -1,5 +1,5 @@
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error: .or(Some(…)).unwrap() found
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--> $DIR/use_unwrap_or.rs:13:20
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--> $DIR/use_unwrap_or.rs:22:20
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LL | let _ = option.or(Some("fallback")).unwrap(); // should trigger lint
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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@ -8,7 +8,7 @@ LL | let _ = option.or(Some("fallback")).unwrap(); // should trigger lint
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= help: use `unwrap_or()` instead
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error: .or(Ok(…)).unwrap() found
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--> $DIR/use_unwrap_or.rs:16:20
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--> $DIR/use_unwrap_or.rs:25:20
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LL | let _ = result.or::<&str>(Ok("fallback")).unwrap(); // should trigger lint
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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