fix clippy tests

Author: folkertdev

src/tools/clippy/clippy_config/src/msrvs.rs

@@ -17,7 +17,8 @@ macro_rules! msrv_aliases {
 
 // names may refer to stabilized feature flags or library items
 msrv_aliases! {
-    1,81,0  { LINT_REASONS_STABILIZATION }
+    1,82,0 { CONST_EXTERN_FN }
+    1,81,0 { LINT_REASONS_STABILIZATION }
     1,80,0 { BOX_INTO_ITER}
     1,77,0 { C_STR_LITERALS }
     1,76,0 { PTR_FROM_REF, OPTION_RESULT_INSPECT }
@@ -26,7 +27,7 @@ msrv_aliases! {
     1,68,0 { PATH_MAIN_SEPARATOR_STR }
     1,65,0 { LET_ELSE, POINTER_CAST_CONSTNESS }
     1,63,0 { CLONE_INTO }
-    1,62,0 { BOOL_THEN_SOME, DEFAULT_ENUM_ATTRIBUTE, CONST_EXTERN_FN }
+    1,62,0 { BOOL_THEN_SOME, DEFAULT_ENUM_ATTRIBUTE, CONST_EXTERN_C_FN }
     1,59,0 { THREAD_LOCAL_CONST_INIT }
     1,58,0 { FORMAT_ARGS_CAPTURE, PATTERN_TRAIT_CHAR_ARRAY, CONST_RAW_PTR_DEREF }
     1,56,0 { CONST_FN_UNION }

src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs

@@ -119,9 +119,7 @@ impl<'tcx> LateLintPass<'tcx> for MissingConstForFn {
                     .iter()
                     .any(|param| matches!(param.kind, GenericParamKind::Const { .. }));
 
-                if already_const(header)
-                    || has_const_generic_params
-                    || !could_be_const_with_abi(cx, &self.msrv, header.abi)
+                if already_const(header) || has_const_generic_params || !could_be_const_with_abi(&self.msrv, header.abi)
                 {
                     return;
                 }
@@ -183,13 +181,13 @@ fn already_const(header: hir::FnHeader) -> bool {
     header.constness == Constness::Const
 }
 
-fn could_be_const_with_abi(cx: &LateContext<'_>, msrv: &Msrv, abi: Abi) -> bool {
+fn could_be_const_with_abi(msrv: &Msrv, abi: Abi) -> bool {
     match abi {
         Abi::Rust => true,
         // `const extern "C"` was stabilized after 1.62.0
-        Abi::C { unwind: false } => msrv.meets(msrvs::CONST_EXTERN_FN),
+        Abi::C { unwind: false } => msrv.meets(msrvs::CONST_EXTERN_C_FN),
         // Rest ABIs are still unstable and need the `const_extern_fn` feature enabled.
-        _ => cx.tcx.features().const_extern_fn,
+        _ => msrv.meets(msrvs::CONST_EXTERN_FN),
     }
 }
 

src/tools/clippy/tests/ui/missing_const_for_fn/cant_be_const.rs

@@ -186,12 +186,6 @@ mod msrv {
     extern "C" fn c() {}
 }
 
-mod with_extern {
-    extern "C-unwind" fn c_unwind() {}
-    extern "system" fn system() {}
-    extern "system-unwind" fn system_unwind() {}
-}
-
 mod with_ty_alias {
     type Foo = impl std::fmt::Debug;
 

src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.fixed

@@ -1,6 +1,5 @@
 #![warn(clippy::missing_const_for_fn)]
 #![allow(unsupported_calling_conventions)]
-#![feature(const_extern_fn)]
 
 const extern "C-unwind" fn c_unwind() {}
 //~^ ERROR: this could be a `const fn`

src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs

@@ -1,6 +1,5 @@
 #![warn(clippy::missing_const_for_fn)]
 #![allow(unsupported_calling_conventions)]
-#![feature(const_extern_fn)]
 
 extern "C-unwind" fn c_unwind() {}
 //~^ ERROR: this could be a `const fn`

src/tools/clippy/tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.stderr

@@ -1,5 +1,5 @@
 error: this could be a `const fn`
-  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:5:1
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:4:1
    |
 LL | extern "C-unwind" fn c_unwind() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -12,7 +12,7 @@ LL | const extern "C-unwind" fn c_unwind() {}
    | +++++
 
 error: this could be a `const fn`
-  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:7:1
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:6:1
    |
 LL | extern "system" fn system() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -23,7 +23,7 @@ LL | const extern "system" fn system() {}
    | +++++
 
 error: this could be a `const fn`
-  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:9:1
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:8:1
    |
 LL | extern "system-unwind" fn system_unwind() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -34,7 +34,7 @@ LL | const extern "system-unwind" fn system_unwind() {}
    | +++++
 
 error: this could be a `const fn`
-  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:11:1
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:10:1
    |
 LL | pub extern "stdcall" fn std_call() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -45,7 +45,7 @@ LL | pub const extern "stdcall" fn std_call() {}
    |     +++++
 
 error: this could be a `const fn`
-  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:13:1
+  --> tests/ui/missing_const_for_fn/could_be_const_with_const_extern_fn.rs:12:1
    |
 LL | pub extern "stdcall-unwind" fn std_call_unwind() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^