Auto merge of #13532 - y21:issue13531, r=Alexendoo

Only emit `manual_c_str_literals` in >= Edition 2021

Fixes #13531

changelog: none

clippy_lints/src/methods/manual_c_str_literals.rs

@@ -6,6 +6,7 @@
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, Node, QPath, TyKind};
 use rustc_lint::LateContext;
+use rustc_span::edition::Edition::Edition2021;
 use rustc_span::{Span, Symbol, sym};
 
 use super::MANUAL_C_STR_LITERALS;
@@ -25,6 +26,7 @@ pub(super) fn check_as_ptr<'tcx>(
 ) {
     if let ExprKind::Lit(lit) = receiver.kind
         && let LitKind::ByteStr(_, StrStyle::Cooked) | LitKind::Str(_, StrStyle::Cooked) = lit.node
+        && cx.tcx.sess.edition() >= Edition2021
         && let casts_removed = peel_ptr_cast_ancestors(cx, expr)
         && !get_parent_expr(cx, casts_removed).is_some_and(
             |parent| matches!(parent.kind, ExprKind::Call(func, _) if is_c_str_function(cx, func).is_some()),
@@ -66,6 +68,7 @@ fn is_c_str_function(cx: &LateContext<'_>, func: &Expr<'_>) -> Option<Symbol> {
 pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, func: &Expr<'_>, args: &[Expr<'_>], msrv: &Msrv) {
     if let Some(fn_name) = is_c_str_function(cx, func)
         && let [arg] = args
+        && cx.tcx.sess.edition() >= Edition2021
         && msrv.meets(msrvs::C_STR_LITERALS)
     {
         match fn_name.as_str() {

tests/ui/manual_c_str_literals.edition2021.fixed

@@ -1,3 +1,6 @@
+//@revisions: edition2018 edition2021
+//@[edition2018] edition:2018
+//@[edition2021] edition:2021
 #![warn(clippy::manual_c_str_literals)]
 #![allow(clippy::no_effect)]
 

tests/ui/manual_c_str_literals.edition2021.stderr

@@ -1,5 +1,5 @@
 error: calling `CStr::new` with a byte string literal
-  --> tests/ui/manual_c_str_literals.rs:31:5
+  --> tests/ui/manual_c_str_literals.rs:34:5
    |
 LL |     CStr::from_bytes_with_nul(b"foo\0");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use a `c""` literal: `c"foo"`
@@ -8,73 +8,73 @@ LL |     CStr::from_bytes_with_nul(b"foo\0");
    = help: to override `-D warnings` add `#[allow(clippy::manual_c_str_literals)]`
 
 error: calling `CStr::new` with a byte string literal
-  --> tests/ui/manual_c_str_literals.rs:35:5
+  --> tests/ui/manual_c_str_literals.rs:38:5
    |
 LL |     CStr::from_bytes_with_nul(b"foo\0");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use a `c""` literal: `c"foo"`
 
 error: calling `CStr::new` with a byte string literal
-  --> tests/ui/manual_c_str_literals.rs:36:5
+  --> tests/ui/manual_c_str_literals.rs:39:5
    |
 LL |     CStr::from_bytes_with_nul(b"foo\x00");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use a `c""` literal: `c"foo"`
 
 error: calling `CStr::new` with a byte string literal
-  --> tests/ui/manual_c_str_literals.rs:37:5
+  --> tests/ui/manual_c_str_literals.rs:40:5
    |
 LL |     CStr::from_bytes_with_nul(b"foo\0").unwrap();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use a `c""` literal: `c"foo"`
 
 error: calling `CStr::new` with a byte string literal
-  --> tests/ui/manual_c_str_literals.rs:38:5
+  --> tests/ui/manual_c_str_literals.rs:41:5
    |
 LL |     CStr::from_bytes_with_nul(b"foo\\0sdsd\0").unwrap();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use a `c""` literal: `c"foo\\0sdsd"`
 
 error: calling `CStr::from_ptr` with a byte string literal
-  --> tests/ui/manual_c_str_literals.rs:43:14
+  --> tests/ui/manual_c_str_literals.rs:46:14
    |
 LL |     unsafe { CStr::from_ptr(b"foo\0".as_ptr().cast()) };
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use a `c""` literal: `c"foo"`
 
 error: calling `CStr::from_ptr` with a byte string literal
-  --> tests/ui/manual_c_str_literals.rs:44:14
+  --> tests/ui/manual_c_str_literals.rs:47:14
    |
 LL |     unsafe { CStr::from_ptr(b"foo\0".as_ptr() as *const _) };
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use a `c""` literal: `c"foo"`
 
 error: manually constructing a nul-terminated string
-  --> tests/ui/manual_c_str_literals.rs:45:23
+  --> tests/ui/manual_c_str_literals.rs:48:23
    |
 LL |     let _: *const _ = b"foo\0".as_ptr();
    |                       ^^^^^^^^ help: use a `c""` literal: `c"foo"`
 
 error: manually constructing a nul-terminated string
-  --> tests/ui/manual_c_str_literals.rs:46:23
+  --> tests/ui/manual_c_str_literals.rs:49:23
    |
 LL |     let _: *const _ = "foo\0".as_ptr();
    |                       ^^^^^^^ help: use a `c""` literal: `c"foo"`
 
 error: manually constructing a nul-terminated string
-  --> tests/ui/manual_c_str_literals.rs:49:23
+  --> tests/ui/manual_c_str_literals.rs:52:23
    |
 LL |     let _: *const _ = b"foo\0".as_ptr().cast::<i8>();
    |                       ^^^^^^^^ help: use a `c""` literal: `c"foo"`
 
 error: manually constructing a nul-terminated string
-  --> tests/ui/manual_c_str_literals.rs:52:13
+  --> tests/ui/manual_c_str_literals.rs:55:13
    |
 LL |     let _ = "电脑\\\0".as_ptr();
    |             ^^^^^^^^^^ help: use a `c""` literal: `c"电脑\\"`
 
 error: manually constructing a nul-terminated string
-  --> tests/ui/manual_c_str_literals.rs:53:13
+  --> tests/ui/manual_c_str_literals.rs:56:13
    |
 LL |     let _ = "电脑\0".as_ptr();
    |             ^^^^^^^^ help: use a `c""` literal: `c"电脑"`
 
 error: manually constructing a nul-terminated string
-  --> tests/ui/manual_c_str_literals.rs:54:13
+  --> tests/ui/manual_c_str_literals.rs:57:13
    |
 LL |     let _ = "电脑\x00".as_ptr();
    |             ^^^^^^^^^^ help: use a `c""` literal: `c"电脑"`

tests/ui/manual_c_str_literals.rs

@@ -1,3 +1,6 @@
+//@revisions: edition2018 edition2021
+//@[edition2018] edition:2018
+//@[edition2021] edition:2021
 #![warn(clippy::manual_c_str_literals)]
 #![allow(clippy::no_effect)]