fix single-char variable names

helix-lsp/src/snippet.rs

@@ -196,7 +196,8 @@ mod parser {
 
     fn var<'a>() -> impl Parser<'a, Output = &'a str> {
         // var = [_a-zA-Z][_a-zA-Z0-9]*
-        move |input: &'a str| match input
+        move |input: &'a str| {
+            input
                 .char_indices()
                 .take_while(|(p, c)| {
                     *c == '_'
@@ -207,12 +208,11 @@ mod parser {
                         }
                 })
                 .last()
-        {
-            Some((index, c)) if index >= 1 => {
+                .map(|(index, c)| {
                     let index = index + c.len_utf8();
-                Ok((&input[index..], &input[0..index]))
-            }
-            _ => Err(input),
+                    (&input[index..], &input[0..index])
+                })
+                .ok_or(input)
         }
     }