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

Author: Urgau

crates/cargo-platform/src/lib.rs

@@ -117,21 +117,25 @@ 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()) {
                             if name.as_str() == "true" || name.as_str() == "false" {
                                 warnings.push(format!(
                                     "[{}] future-incompatibility: the meaning of `cfg({e})` will change in the future\n \
                                      | Cargo is erroneously allowing `cfg(true)` and `cfg(false)`, but both forms are interpreted as false unless manually overridden with `--cfg`.\n \
                                      | In the future these will be built-in defines that will have the corresponding true/false value.\n \
                                      | It is recommended to avoid using these configs until they are properly supported.\n \
-                                     | See <https://github.com/rust-lang/rust/issues/131204> for more information.",
+                                     | See <https://github.com/rust-lang/rust/issues/131204> for more information.\n \
+                                     |\n \
+                                     | help: use raw-idents instead: `cfg(r#{name})`",
                                     path.display()
                                 ));
                             } else {
                                 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

@@ -544,11 +544,6 @@ fn cfg_raw_idents() {
 
     p.cargo("check")
         .with_stderr_data(str![[r#"
-[WARNING] [[ROOT]/foo/Cargo.toml] future-incompatibility: the meaning of `cfg(r#true)` will change in the future
- | Cargo is erroneously allowing `cfg(true)` and `cfg(false)`, but both forms are interpreted as false unless manually overridden with `--cfg`.
- | In the future these will be built-in defines that will have the corresponding true/false value.
- | It is recommended to avoid using these configs until they are properly supported.
- | See <https://github.com/rust-lang/rust/issues/131204> for more information.
 [LOCKING] 1 package to latest compatible version
 [CHECKING] foo v0.1.0 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
@@ -648,11 +643,15 @@ fn cfg_keywords() {
  | In the future these will be built-in defines that will have the corresponding true/false value.
  | It is recommended to avoid using these configs until they are properly supported.
  | See <https://github.com/rust-lang/rust/issues/131204> for more information.
+ |
+ | [HELP] use raw-idents instead: `cfg(r#true)`
 [WARNING] [.cargo/config.toml] future-incompatibility: the meaning of `cfg(false)` will change in the future
  | Cargo is erroneously allowing `cfg(true)` and `cfg(false)`, but both forms are interpreted as false unless manually overridden with `--cfg`.
  | In the future these will be built-in defines that will have the corresponding true/false value.
  | It is recommended to avoid using these configs until they are properly supported.
  | See <https://github.com/rust-lang/rust/issues/131204> for more information.
+ |
+ | [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