From 79a3dd085c2e9b906c33a1ae1194449d02832036 Mon Sep 17 00:00:00 2001
From: kjeremy <kjeremy@gmail.com>
Date: Tue, 21 Jul 2020 14:18:22 -0400
Subject: Clear diagnostics for known file version on close

---
 crates/rust-analyzer/src/main_loop.rs | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'crates')

diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index 00ae6b900..d8d10ba99 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -432,19 +432,26 @@ impl GlobalState {
                 Ok(())
             })?
             .on::<lsp_types::notification::DidCloseTextDocument>(|this, params| {
+                let mut version = None;
                 if let Ok(path) = from_proto::vfs_path(&params.text_document.uri) {
-                    if this.mem_docs.remove(&path).is_none() {
-                        log::error!("orphan DidCloseTextDocument: {}", path)
+                    match this.mem_docs.remove(&path) {
+                        Some(entry) => version = entry,
+                        None => log::error!("orphan DidCloseTextDocument: {}", path),
                     }
+
                     if let Some(path) = path.as_path() {
                         this.loader.handle.invalidate(path.to_path_buf());
                     }
                 }
+
+                // Clear the diagnostics for the previously known version of the file.
+                // This prevents stale "cargo check" diagnostics if the file is
+                // closed, "cargo check" is run and then the file is reopened.
                 this.send_notification::<lsp_types::notification::PublishDiagnostics>(
                     lsp_types::PublishDiagnosticsParams {
                         uri: params.text_document.uri,
                         diagnostics: Vec::new(),
-                        version: None,
+                        version,
                     },
                 );
                 Ok(())
-- 
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