From d610adfc2bfe3d4e9fec61b7a5bc02cfea503384 Mon Sep 17 00:00:00 2001
From: Evgenii P <eupn@protonmail.com>
Date: Sun, 4 Aug 2019 08:03:17 +0700
Subject: Employ early return pattern more

---
 crates/ra_hir/src/source_binder.rs               | 18 ++++++-------
 crates/ra_ide_api/src/completion/complete_dot.rs | 34 +++++++++++++-----------
 2 files changed, 27 insertions(+), 25 deletions(-)

diff --git a/crates/ra_hir/src/source_binder.rs b/crates/ra_hir/src/source_binder.rs
index cf9a9e108..2c4cedd8b 100644
--- a/crates/ra_hir/src/source_binder.rs
+++ b/crates/ra_hir/src/source_binder.rs
@@ -428,20 +428,18 @@ impl SourceAnalyzer {
         let std_future_trait =
             match self.resolver.resolve_path_segments(db, &std_future_path).into_fully_resolved() {
                 PerNs { types: Some(Resolution::Def(ModuleDef::Trait(trait_))), .. } => {
-                    Some(trait_)
+                    trait_
                 }
-                _ => None,
+                _ => return false,
             };
 
-        let krate = self.resolver.krate();
-        if let Some(krate) = krate {
-            if let Some(trait_) = std_future_trait {
-                let canonical_ty = crate::ty::Canonical { value: ty, num_vars: 0 };
-                return implements_trait(&canonical_ty, db, &self.resolver, krate, trait_);
-            }
-        }
+        let krate = match self.resolver.krate() {
+            Some(krate) => krate,
+            _ => return false,
+        };
 
-        false
+        let canonical_ty = crate::ty::Canonical { value: ty, num_vars: 0 };
+        return implements_trait(&canonical_ty, db, &self.resolver, krate, std_future_trait);
     }
 
     #[cfg(test)]
diff --git a/crates/ra_ide_api/src/completion/complete_dot.rs b/crates/ra_ide_api/src/completion/complete_dot.rs
index 9a3b353a9..d43ff2eec 100644
--- a/crates/ra_ide_api/src/completion/complete_dot.rs
+++ b/crates/ra_ide_api/src/completion/complete_dot.rs
@@ -9,23 +9,27 @@ use rustc_hash::FxHashSet;
 
 /// Complete dot accesses, i.e. fields or methods (and .await syntax).
 pub(super) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) {
-    if let Some(dot_receiver) = &ctx.dot_receiver {
-        let receiver_ty = ctx.analyzer.type_of(ctx.db, &dot_receiver);
+    let dot_receiver = match &ctx.dot_receiver {
+        Some(expr) => expr,
+        _ => return,
+    };
 
-        if let Some(receiver_ty) = receiver_ty {
-            if !ctx.is_call {
-                complete_fields(acc, ctx, receiver_ty.clone());
-            }
-            complete_methods(acc, ctx, receiver_ty.clone());
+    let receiver_ty = match ctx.analyzer.type_of(ctx.db, &dot_receiver) {
+        Some(ty) => ty,
+        _ => return,
+    };
 
-            // Suggest .await syntax for types that implement Future trait
-            if ctx.analyzer.impls_future(ctx.db, receiver_ty) {
-                CompletionItem::new(CompletionKind::Keyword, ctx.source_range(), "await")
-                    .detail("expr.await")
-                    .insert_text("await")
-                    .add_to(acc);
-            }
-        }
+    if !ctx.is_call {
+        complete_fields(acc, ctx, receiver_ty.clone());
+    }
+    complete_methods(acc, ctx, receiver_ty.clone());
+
+    // Suggest .await syntax for types that implement Future trait
+    if ctx.analyzer.impls_future(ctx.db, receiver_ty) {
+        CompletionItem::new(CompletionKind::Keyword, ctx.source_range(), "await")
+            .detail("expr.await")
+            .insert_text("await")
+            .add_to(acc);
     }
 }
 
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