fix: better error message for rust version incompatibility (#16021)

fix #16018 .

Author: epage

src/cargo/util/toml/mod.rs

@@ -1311,7 +1311,7 @@ pub fn to_real_manifest(
                 let edition_msrv = RustVersion::try_from(edition_msrv).unwrap();
                 if !edition_msrv.is_compatible_with(pkg_msrv.as_partial()) {
                     bail!(
-                        "rust-version {} is older than first version ({}) required by \
+                        "rust-version {} is imcompatible with the version ({}) required by \
                             the specified edition ({})",
                         pkg_msrv,
                         edition_msrv,

tests/testsuite/rust_version.rs

@@ -82,7 +82,7 @@ fn rust_version_older_than_edition() {
 [ERROR] failed to parse manifest at `[ROOT]/foo/Cargo.toml`
 
 Caused by:
-  rust-version 1.1 is older than first version (1.31.0) required by the specified edition (2018)
+  rust-version 1.1 is imcompatible with the version (1.31.0) required by the specified edition (2018)
 
 "#]])
         .run();