fix: Added handling for build-std when preparing build-script metadata

Author: ranger-ross

src/cargo/core/compiler/custom_build.rs

@@ -464,20 +464,33 @@ fn build_work(build_runner: &mut BuildRunner<'_, '_>, unit: &Unit) -> CargoResul
             if dep.unit.mode.is_run_custom_build() {
                 let dep_metadata = build_runner.get_run_build_script_metadata(&dep.unit);
 
-                let Some(dependency) = unit.pkg.dependencies().iter().find(|d| {
-                    d.package_name() == dep.unit.pkg.name()
-                        && d.source_id() == dep.unit.pkg.package_id().source_id()
-                        && d.version_req().matches(dep.unit.pkg.version())
-                }) else {
-                    panic!(
-                        "Dependency `{}` not found in `{}`s dependencies",
-                        dep.unit.pkg.name(),
-                        unit.pkg.name()
-                    )
-                };
+                let dependency_name = unit
+                    .pkg
+                    .dependencies()
+                    .iter()
+                    .find(|d| {
+                        d.package_name() == dep.unit.pkg.name()
+                            && d.source_id() == dep.unit.pkg.package_id().source_id()
+                            && d.version_req().matches(dep.unit.pkg.version())
+                    })
+                    .map(|d| d.name_in_toml())
+                    .unwrap_or_else(|| {
+                        if dep.unit.is_std {
+                            // If the depenency is a build-std dependency, it might not be in
+                            // Cargo.toml. If its not present, we simply use the package name as we
+                            // know its not renamed.
+                            dep.unit.pkg.name()
+                        } else {
+                            panic!(
+                                "Dependency `{}` not found in `{}`s dependencies",
+                                dep.unit.pkg.name(),
+                                unit.pkg.name()
+                            )
+                        }
+                    });
 
                 Some((
-                    dependency.name_in_toml(),
+                    dependency_name,
                     dep.unit
                         .pkg
                         .manifest()