Now also lints non-exhaustive structs

Author: Centri3

clippy_lints/src/let_else_on_result_ok.rs

@@ -7,7 +7,10 @@ use clippy_utils::{
 };
 use rustc_hir::{ExprKind, FnRetTy, ItemKind, OwnerNode, Stmt, StmtKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
-use rustc_middle::{lint::in_external_macro, ty};
+use rustc_middle::{
+    lint::in_external_macro,
+    ty::{self, VariantDef},
+};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::sym;
 use std::ops::ControlFlow;
@@ -107,7 +110,12 @@ impl<'tcx> LateLintPass<'tcx> for LetElseOnResultOk {
                         && let [_, err_ty] = substs.as_slice()
                         && let Some(err_ty) = err_ty.as_type()
                         && let Some(err_def) = err_ty.ty_adt_def()
-                        && err_def.all_fields().count() != 0
+                        && (err_def.all_fields().count() != 0
+                            || err_def
+                                .variants()
+                                .iter()
+                                .any(VariantDef::is_field_list_non_exhaustive)
+                            || err_def.is_variant_list_non_exhaustive())
                     {
                         spans.push(pat.span);
                     }

tests/ui/let_else_on_result_ok.rs

@@ -30,6 +30,12 @@ union F {
     a: u32,
 }
 
+#[non_exhaustive]
+struct G {}
+
+#[non_exhaustive]
+enum H {}
+
 fn a() -> Result<(), ()> {
     Ok(())
 }
@@ -57,6 +63,14 @@ fn f() -> Result<(), F> {
     todo!()
 }
 
+fn g() -> Result<(), G> {
+    todo!()
+}
+
+fn h() -> Result<(), H> {
+    todo!()
+}
+
 fn a_constructor() -> A {
     todo!();
 }
@@ -76,6 +90,12 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let Ok(_) = f() else {
         return Ok(());
     };
+    let Ok(_) = g() else {
+        return Ok(());
+    };
+    let Ok(_) = h() else {
+        return Ok(());
+    };
     // Don't lint
     loop {
         let Ok(_) = c() else {

tests/ui/let_else_on_result_ok.stderr

@@ -1,5 +1,5 @@
 error: usage of `let...else` on `Ok`
-  --> $DIR/let_else_on_result_ok.rs:70:9
+  --> $DIR/let_else_on_result_ok.rs:84:9
    |
 LL |     let Ok(_) = c() else {
    |         ^^^^^
@@ -9,7 +9,7 @@ LL |     let Ok(_) = c() else {
    = note: `-D clippy::let-else-on-result-ok` implied by `-D warnings`
 
 error: usage of `let...else` on `Ok`
-  --> $DIR/let_else_on_result_ok.rs:73:9
+  --> $DIR/let_else_on_result_ok.rs:87:9
    |
 LL |     let Ok(_) = e() else {
    |         ^^^^^
@@ -18,13 +18,31 @@ LL |     let Ok(_) = e() else {
    = help: consider using a `match` instead, or propagating it to the caller
 
 error: usage of `let...else` on `Ok`
-  --> $DIR/let_else_on_result_ok.rs:76:9
+  --> $DIR/let_else_on_result_ok.rs:90:9
    |
 LL |     let Ok(_) = f() else {
    |         ^^^^^
    |
    = note: this will ignore the contents of the `Err` variant
    = help: consider using a `match` instead, or propagating it to the caller
 
-error: aborting due to 3 previous errors
+error: usage of `let...else` on `Ok`
+  --> $DIR/let_else_on_result_ok.rs:93:9
+   |
+LL |     let Ok(_) = g() else {
+   |         ^^^^^
+   |
+   = note: this will ignore the contents of the `Err` variant
+   = help: consider using a `match` instead, or propagating it to the caller
+
+error: usage of `let...else` on `Ok`
+  --> $DIR/let_else_on_result_ok.rs:96:9
+   |
+LL |     let Ok(_) = h() else {
+   |         ^^^^^
+   |
+   = note: this will ignore the contents of the `Err` variant
+   = help: consider using a `match` instead, or propagating it to the caller
+
+error: aborting due to 5 previous errors