From 4c95c6e25d7765798fc527f11beb6c039c6adabe Mon Sep 17 00:00:00 2001
From: Kirill Bulatov <mail4score@gmail.com>
Date: Wed, 25 Nov 2020 00:02:45 +0200
Subject: [PATCH 1/2] Gate autoimports begind experimental completions flag

---
 crates/completion/src/completions/unqualified_path.rs | 4 +++-
 crates/completion/src/config.rs                       | 2 ++
 crates/rust-analyzer/src/config.rs                    | 3 +++
 editors/code/package.json                             | 5 +++++
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/crates/completion/src/completions/unqualified_path.rs b/crates/completion/src/completions/unqualified_path.rs
index 86c143b637f..4f1c9faa083 100644
--- a/crates/completion/src/completions/unqualified_path.rs
+++ b/crates/completion/src/completions/unqualified_path.rs
@@ -44,7 +44,9 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
         acc.add_resolution(ctx, name.to_string(), &res)
     });
 
-    fuzzy_completion(acc, ctx).unwrap_or_default()
+    if ctx.config.enable_experimental_completions {
+        fuzzy_completion(acc, ctx).unwrap_or_default()
+    }
 }
 
 fn complete_enum_variants(acc: &mut Completions, ctx: &CompletionContext, ty: &Type) {
diff --git a/crates/completion/src/config.rs b/crates/completion/src/config.rs
index 82874ff256a..f5073537295 100644
--- a/crates/completion/src/config.rs
+++ b/crates/completion/src/config.rs
@@ -9,6 +9,7 @@
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct CompletionConfig {
     pub enable_postfix_completions: bool,
+    pub enable_experimental_completions: bool,
     pub add_call_parenthesis: bool,
     pub add_call_argument_snippets: bool,
     pub snippet_cap: Option<SnippetCap>,
@@ -30,6 +31,7 @@ impl Default for CompletionConfig {
     fn default() -> Self {
         CompletionConfig {
             enable_postfix_completions: true,
+            enable_experimental_completions: true,
             add_call_parenthesis: true,
             add_call_argument_snippets: true,
             snippet_cap: Some(SnippetCap { _private: () }),
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 5fc6800cf2f..a334cdb116a 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -184,6 +184,7 @@ pub fn new(root_path: AbsPathBuf) -> Self {
             },
             completion: CompletionConfig {
                 enable_postfix_completions: true,
+                enable_experimental_completions: true,
                 add_call_parenthesis: true,
                 add_call_argument_snippets: true,
                 ..CompletionConfig::default()
@@ -306,6 +307,7 @@ pub fn update(&mut self, json: serde_json::Value) {
         };
 
         self.completion.enable_postfix_completions = data.completion_postfix_enable;
+        self.completion.enable_experimental_completions = data.completion_enableExperimental;
         self.completion.add_call_parenthesis = data.completion_addCallParenthesis;
         self.completion.add_call_argument_snippets = data.completion_addCallArgumentSnippets;
         self.completion.merge = self.assist.insert_use.merge;
@@ -506,6 +508,7 @@ struct ConfigData {
         completion_addCallArgumentSnippets: bool = true,
         completion_addCallParenthesis: bool      = true,
         completion_postfix_enable: bool          = true,
+        completion_enableExperimental: bool      = true,
 
         diagnostics_enable: bool                = true,
         diagnostics_enableExperimental: bool    = true,
diff --git a/editors/code/package.json b/editors/code/package.json
index a2d6b1148fa..5bf72075f50 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -460,6 +460,11 @@
                     "default": true,
                     "markdownDescription": "Whether to show postfix snippets like `dbg`, `if`, `not`, etc."
                 },
+                "rust-analyzer.completion.enableExperimental": {
+                    "type": "boolean",
+                    "default": true,
+                    "markdownDescription": "Display additional completions with potential false positives and performance issues"
+                },
                 "rust-analyzer.callInfo.full": {
                     "type": "boolean",
                     "default": true,

From 9812150047ea5f53631762e83ed25177e821857f Mon Sep 17 00:00:00 2001
From: Kirill Bulatov <mail4score@gmail.com>
Date: Wed, 25 Nov 2020 00:42:58 +0200
Subject: [PATCH 2/2] Document experimental completions

---
 crates/completion/src/lib.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/crates/completion/src/lib.rs b/crates/completion/src/lib.rs
index cb6e0554e9a..aecc1378b1b 100644
--- a/crates/completion/src/lib.rs
+++ b/crates/completion/src/lib.rs
@@ -67,6 +67,13 @@
 //     fn test_name() {}
 // }
 // ```
+//
+// And experimental completions, enabled with the `rust-analyzer.completion.enableExperimental` setting.
+// This flag enables or disables:
+//
+// - Auto import: additional completion options with automatic `use` import and options from all project importable items, matched for the input
+//
+// Experimental completions might cause issues with performance and completion list look.
 
 /// Main entry point for completion. We run completion as a two-phase process.
 ///