Adjust future-incompat cfg keyword with raw-idents in cfgs

Author: Urgau

crates/cargo-platform/src/lib.rs

@@ -117,11 +117,13 @@ impl Platform {
                 }
                 CfgExpr::Value(ref e) => match e {
                     Cfg::Name(name) | Cfg::KeyPair(name, _) => {
-                        if KEYWORDS.contains(&name.as_str()) {
+                        if !name.raw && KEYWORDS.contains(&name.as_str()) {
                             warnings.push(format!(
                                 "[{}] future-incompatibility: `cfg({e})` is deprecated as `{name}` is a keyword \
                                  and not an identifier and should not have have been accepted in this position.\n \
-                                 | this was previously accepted by Cargo but is being phased out; it will become a hard error in a future release!",
+                                 | this was previously accepted by Cargo but is being phased out; it will become a hard error in a future release!\n \
+                                 |\n \
+                                 | help: use raw-idents instead: `cfg(r#{name})`",
                                  path.display()
                             ));
                         }

tests/testsuite/cfg.rs

@@ -544,8 +544,6 @@ fn cfg_raw_idents() {
 
     p.cargo("check")
         .with_stderr_data(str![[r#"
-[WARNING] [[ROOT]/foo/Cargo.toml] future-incompatibility: `cfg(r#fn)` is deprecated as `r#fn` is a keyword and not an identifier and should not have have been accepted in this position.
- | this was previously accepted by Cargo but is being phased out; it will become a hard error in a future release!
 [LOCKING] 1 package to latest compatible version
 [CHECKING] foo v0.1.0 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
@@ -642,8 +640,12 @@ fn cfg_keywords() {
         .with_stderr_data(str![[r#"
 [WARNING] [[ROOT]/foo/Cargo.toml] future-incompatibility: `cfg(true)` is deprecated as `true` is a keyword and not an identifier and should not have have been accepted in this position.
  | this was previously accepted by Cargo but is being phased out; it will become a hard error in a future release!
+ |
+ | [HELP] use raw-idents instead: `cfg(r#true)`
 [WARNING] [.cargo/config.toml] future-incompatibility: `cfg(false)` is deprecated as `false` is a keyword and not an identifier and should not have have been accepted in this position.
  | this was previously accepted by Cargo but is being phased out; it will become a hard error in a future release!
+ |
+ | [HELP] use raw-idents instead: `cfg(r#false)`
 [LOCKING] 1 package to latest compatible version
 [CHECKING] foo v0.1.0 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s