Use proc-macro-srv from sysroot in rust-project.json

Author: Joseph Ryan

crates/rust-analyzer/src/reload.rs

@@ -314,7 +314,9 @@ impl GlobalState {
                         let mut args = args.clone();
                         let mut path = path.clone();
 
-                        if let ProjectWorkspace::Cargo { sysroot, .. } = ws {
+                        if let ProjectWorkspace::Cargo { sysroot, .. }
+                        | ProjectWorkspace::Json { sysroot, .. } = ws
+                        {
                             tracing::debug!("Found a cargo workspace...");
                             if let Some(sysroot) = sysroot.as_ref() {
                                 tracing::debug!("Found a cargo workspace with a sysroot...");