From 6c676909dd94f48ab1e85427071b508f104f360f Mon Sep 17 00:00:00 2001
From: Yuki Kodama <endflow.net@gmail.com>
Date: Sun, 24 May 2020 18:09:42 +0900
Subject: Strip leading underscore

---
 crates/ra_ide/src/display/function_signature.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'crates/ra_ide/src')

diff --git a/crates/ra_ide/src/display/function_signature.rs b/crates/ra_ide/src/display/function_signature.rs
index 9572debd8..4f054398a 100644
--- a/crates/ra_ide/src/display/function_signature.rs
+++ b/crates/ra_ide/src/display/function_signature.rs
@@ -187,6 +187,14 @@ impl FunctionSignature {
 
 impl From<&'_ ast::FnDef> for FunctionSignature {
     fn from(node: &ast::FnDef) -> FunctionSignature {
+        fn strip_leading_underscore(name: String) -> String {
+            if name.starts_with("_") {
+                name.get(1..).unwrap_or_default().to_string()
+            } else {
+                name
+            }
+        }
+
         fn param_list(node: &ast::FnDef) -> (bool, Vec<String>, Vec<String>) {
             let mut res = vec![];
             let mut res_types = vec![];
@@ -230,7 +238,7 @@ impl From<&'_ ast::FnDef> for FunctionSignature {
                     param_list
                         .params()
                         .map(|param| {
-                            Some(
+                            Some(strip_leading_underscore(
                                 param
                                     .pat()?
                                     .syntax()
@@ -238,7 +246,7 @@ impl From<&'_ ast::FnDef> for FunctionSignature {
                                     .find_map(ast::Name::cast)?
                                     .text()
                                     .to_string(),
-                            )
+                            ))
                         })
                         .map(|param| param.unwrap_or_default()),
                 );
-- 
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