Rollup merge of #88860 - nbdd0121:panic, r=m-ou-se

[rust.git] / clippy_lints / src / unwrap_in_result.rs

diff --git a/clippy_lints/src/unwrap_in_result.rs b/clippy_lints/src/unwrap_in_result.rs
index fde3102933098415d2aece0bc10df6aac083f302..a4680ae137b3254e13f3c318448194a10211c8f9 100644 (file)
--- a/clippy_lints/src/unwrap_in_result.rs
+++ b/clippy_lints/src/unwrap_in_result.rs
@@ -1,6 +1,10 @@
-use crate::utils::{is_type_diagnostic_item, method_chain_args, return_ty, span_lint_and_then};
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{method_chain_args, return_ty};
 use if_chain::if_chain;
 use rustc_hir as hir;
+use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
+use rustc_hir::{Expr, ImplItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::hir::map::Map;
 use rustc_middle::ty;
@@ -8,13 +12,16 @@
 use rustc_span::{sym, Span};
 
 declare_clippy_lint! {
-    /// **What it does:** Checks for functions of type Result that contain `expect()` or `unwrap()`
+    /// ### What it does
+    /// Checks for functions of type Result that contain `expect()` or `unwrap()`
     ///
-    /// **Why is this bad?** These functions promote recoverable errors to non-recoverable errors which may be undesirable in code bases which wish to avoid panics.
+    /// ### Why is this bad?
+    /// These functions promote recoverable errors to non-recoverable errors which may be undesirable in code bases which wish to avoid panics.
     ///
-    /// **Known problems:** This can cause false positives in functions that handle both recoverable and non recoverable errors.
+    /// ### Known problems
+    /// This can cause false positives in functions that handle both recoverable and non recoverable errors.
     ///
-    /// **Example:**
+    /// ### Example
     /// Before:
     /// ```rust
     /// fn divisible_by_3(i_str: String) -> Result<(), String> {
@@ -57,8 +64,8 @@ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::Impl
             // first check if it's a method or function
             if let hir::ImplItemKind::Fn(ref _signature, _) = impl_item.kind;
             // checking if its return type is `result` or `option`
-            if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id), sym::result_type)
-                || is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id), sym::option_type);
+            if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id()), sym::Result)
+                || is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id()), sym::Option);
             then {
                 lint_impl_body(cx, impl_item.span, impl_item);
             }
@@ -66,9 +73,6 @@ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::Impl
     }
 }
 
-use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
-use rustc_hir::{Expr, ImplItemKind};
-
 struct FindExpectUnwrap<'a, 'tcx> {
     lcx: &'a LateContext<'tcx>,
     typeck_results: &'tcx ty::TypeckResults<'tcx>,
@@ -82,8 +86,8 @@ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
         // check for `expect`
         if let Some(arglists) = method_chain_args(expr, &["expect"]) {
             let reciever_ty = self.typeck_results.expr_ty(&arglists[0][0]).peel_refs();
-            if is_type_diagnostic_item(self.lcx, reciever_ty, sym::option_type)
-                || is_type_diagnostic_item(self.lcx, reciever_ty, sym::result_type)
+            if is_type_diagnostic_item(self.lcx, reciever_ty, sym::Option)
+                || is_type_diagnostic_item(self.lcx, reciever_ty, sym::Result)
             {
                 self.result.push(expr.span);
             }
@@ -92,8 +96,8 @@ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
         // check for `unwrap`
         if let Some(arglists) = method_chain_args(expr, &["unwrap"]) {
             let reciever_ty = self.typeck_results.expr_ty(&arglists[0][0]).peel_refs();
-            if is_type_diagnostic_item(self.lcx, reciever_ty, sym::option_type)
-                || is_type_diagnostic_item(self.lcx, reciever_ty, sym::result_type)
+            if is_type_diagnostic_item(self.lcx, reciever_ty, sym::Option)
+                || is_type_diagnostic_item(self.lcx, reciever_ty, sym::Result)
             {
                 self.result.push(expr.span);
             }
@@ -109,32 +113,27 @@ fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
 }
 
 fn lint_impl_body<'tcx>(cx: &LateContext<'tcx>, impl_span: Span, impl_item: &'tcx hir::ImplItem<'_>) {
-    if_chain! {
-
-        if let ImplItemKind::Fn(_, body_id) = impl_item.kind;
-        then {
-            let body = cx.tcx.hir().body(body_id);
-            let impl_item_def_id = cx.tcx.hir().local_def_id(impl_item.hir_id);
-            let mut fpu = FindExpectUnwrap {
-                lcx: cx,
-                typeck_results: cx.tcx.typeck(impl_item_def_id),
-                result: Vec::new(),
-            };
-            fpu.visit_expr(&body.value);
+    if let ImplItemKind::Fn(_, body_id) = impl_item.kind {
+        let body = cx.tcx.hir().body(body_id);
+        let mut fpu = FindExpectUnwrap {
+            lcx: cx,
+            typeck_results: cx.tcx.typeck(impl_item.def_id),
+            result: Vec::new(),
+        };
+        fpu.visit_expr(&body.value);
 
-            // if we've found one, lint
-            if  !fpu.result.is_empty()  {
-                span_lint_and_then(
-                    cx,
-                    UNWRAP_IN_RESULT,
-                    impl_span,
-                    "used unwrap or expect in a function that returns result or option",
-                    move |diag| {
-                        diag.help(
-                            "unwrap and expect should not be used in a function that returns result or option" );
-                        diag.span_note(fpu.result, "potential non-recoverable error(s)");
-                    });
-            }
+        // if we've found one, lint
+        if !fpu.result.is_empty() {
+            span_lint_and_then(
+                cx,
+                UNWRAP_IN_RESULT,
+                impl_span,
+                "used unwrap or expect in a function that returns result or option",
+                move |diag| {
+                    diag.help("unwrap and expect should not be used in a function that returns result or option");
+                    diag.span_note(fpu.result, "potential non-recoverable error(s)");
+                },
+            );
         }
     }
 }