4 files changed, 40 insertions, 3 deletions

diff --git a/crates/assists/src/handlers/auto_import.rs b/crates/assists/src/handlers/auto_import.rs
index b9ec3f10b..c4770f336 100644
--- a/crates/assists/src/handlers/auto_import.rs
+++ b/crates/assists/src/handlers/auto_import.rs
@@ -239,7 +239,7 @@ impl ImportCandidate {
             return None;
         }
         Some(Self::TraitMethod(
-            sema.type_of_expr(&method_call.expr()?)?,
+            sema.type_of_expr(&method_call.receiver()?)?,
             method_call.name_ref()?.syntax().to_string(),
         ))
     }
diff --git a/crates/assists/src/handlers/invert_if.rs b/crates/assists/src/handlers/invert_if.rs
index f0e047538..294256297 100644
--- a/crates/assists/src/handlers/invert_if.rs
+++ b/crates/assists/src/handlers/invert_if.rs
@@ -106,4 +106,22 @@ mod tests {
             "fn f() { i<|>f let Some(_) = Some(1) { 1 } else { 0 } }",
         )
     }
+
+    #[test]
+    fn invert_if_option_case() {
+        check_assist(
+            invert_if,
+            "fn f() { if<|> doc_style.is_some() { Class::DocComment } else { Class::Comment } }",
+            "fn f() { if doc_style.is_none() { Class::Comment } else { Class::DocComment } }",
+        )
+    }
+
+    #[test]
+    fn invert_if_result_case() {
+        check_assist(
+            invert_if,
+            "fn f() { i<|>f doc_style.is_err() { Class::Err } else { Class::Ok } }",
+            "fn f() { if doc_style.is_ok() { Class::Ok } else { Class::Err } }",
+        )
+    }
 }
diff --git a/crates/assists/src/handlers/replace_unwrap_with_match.rs b/crates/assists/src/handlers/replace_unwrap_with_match.rs
index 9705f11b7..4043c219c 100644
--- a/crates/assists/src/handlers/replace_unwrap_with_match.rs
+++ b/crates/assists/src/handlers/replace_unwrap_with_match.rs
@@ -42,7 +42,7 @@ pub(crate) fn replace_unwrap_with_match(acc: &mut Assists, ctx: &AssistContext)
     if name.text() != "unwrap" {
         return None;
     }
-    let caller = method_call.expr()?;
+    let caller = method_call.receiver()?;
     let ty = ctx.sema.type_of_expr(&caller)?;
     let happy_variant = TryEnum::from_ty(&ctx.sema, &ty)?.happy_case();
     let target = method_call.syntax().text_range();
diff --git a/crates/assists/src/utils.rs b/crates/assists/src/utils.rs
index d071d6502..e15c982e7 100644
--- a/crates/assists/src/utils.rs
+++ b/crates/assists/src/utils.rs
@@ -11,7 +11,7 @@ use syntax::{
     ast::{self, make, NameOwner},
     AstNode, Direction,
     SyntaxKind::*,
-    SyntaxNode, TextSize, T,
+    SyntaxNode, SyntaxText, TextSize, T,
 };
 
 use crate::assist_config::SnippetCap;
@@ -179,6 +179,25 @@ fn invert_special_case(expr: &ast::Expr) -> Option<ast::Expr> {
             ast::BinOp::EqualityTest => bin.replace_op(T![!=]).map(|it| it.into()),
             _ => None,
         },
+        ast::Expr::MethodCallExpr(mce) => {
+            const IS_SOME_TEXT: &str = "is_some";
+            const IS_NONE_TEXT: &str = "is_none";
+            const IS_OK_TEXT: &str = "is_ok";
+            const IS_ERR_TEXT: &str = "is_err";
+
+            let name = mce.name_ref()?;
+            let name_text = name.text();
+
+            let caller = || -> Option<SyntaxText> { Some(mce.receiver()?.syntax().text()) };
+
+            match name_text {
+                x if x == IS_SOME_TEXT => make::expr_method_call(IS_NONE_TEXT, caller),
+                x if x == IS_NONE_TEXT => make::expr_method_call(IS_SOME_TEXT, caller),
+                x if x == IS_OK_TEXT => make::expr_method_call(IS_ERR_TEXT, caller),
+                x if x == IS_ERR_TEXT => make::expr_method_call(IS_OK_TEXT, caller),
+                _ => None,
+            }
+        }
         ast::Expr::PrefixExpr(pe) if pe.op_kind()? == ast::PrefixOp::Not => pe.expr(),
         // FIXME:
         // ast::Expr::Literal(true | false )