From bff812ddfe4a1b209e25727e837699b21fb51f0b Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Mon, 5 Oct 2020 20:22:44 +0200
Subject: Fix feature name

---
 crates/ide/src/completion/complete_postfix/format_like.rs |  2 +-
 xtask/src/codegen/gen_feature_docs.rs                     | 12 +++++++-----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/crates/ide/src/completion/complete_postfix/format_like.rs b/crates/ide/src/completion/complete_postfix/format_like.rs
index 0287fc803..81c33bf3a 100644
--- a/crates/ide/src/completion/complete_postfix/format_like.rs
+++ b/crates/ide/src/completion/complete_postfix/format_like.rs
@@ -1,4 +1,4 @@
-// Feature: Postfix completion for `format`-like strings.
+// Feature: Format String Completion.
 //
 // `"Result {result} is {2 + 2}"` is expanded to the `"Result {} is {}", result, 2 + 2`.
 //
diff --git a/xtask/src/codegen/gen_feature_docs.rs b/xtask/src/codegen/gen_feature_docs.rs
index 3f0013e82..341e67c73 100644
--- a/xtask/src/codegen/gen_feature_docs.rs
+++ b/xtask/src/codegen/gen_feature_docs.rs
@@ -38,7 +38,9 @@ impl Feature {
 
             for block in comment_blocks {
                 let id = block.id;
-                assert!(is_valid_feature_name(&id), "invalid feature name: {:?}", id);
+                if let Err(msg) = is_valid_feature_name(&id) {
+                    panic!("invalid feature name: {:?}:\n  {}", id, msg)
+                }
                 let doc = block.contents.join("\n");
                 let location = Location::new(path.clone(), block.line);
                 acc.push(Feature { id, location, doc })
@@ -49,7 +51,7 @@ impl Feature {
     }
 }
 
-fn is_valid_feature_name(feature: &str) -> bool {
+fn is_valid_feature_name(feature: &str) -> Result<(), String> {
     'word: for word in feature.split_whitespace() {
         for &short in ["to", "and"].iter() {
             if word == short {
@@ -58,14 +60,14 @@ fn is_valid_feature_name(feature: &str) -> bool {
         }
         for &short in ["To", "And"].iter() {
             if word == short {
-                return false;
+                return Err(format!("Don't capitalize {:?}", word));
             }
         }
         if !word.starts_with(char::is_uppercase) {
-            return false;
+            return Err(format!("Capitalize {:?}", word));
         }
     }
-    true
+    Ok(())
 }
 
 impl fmt::Display for Feature {
-- 
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