Re-wrap accept_as_ident string patterns

There were some confusingly asymmetric line lengths I guess from old
rustfmt and some keywords being unreserved.
diff --git a/src/ident.rs b/src/ident.rs
index f5a76a1..63898c6 100644
--- a/src/ident.rs
+++ b/src/ident.rs
@@ -19,17 +19,17 @@
 #[cfg(feature = "parsing")]
 fn accept_as_ident(ident: &Ident) -> bool {
     match ident.to_string().as_str() {
-        "_"
+        "_" |
         // Based on https://doc.rust-lang.org/grammar.html#keywords
         // and https://github.com/rust-lang/rfcs/blob/master/text/2421-unreservations-2018.md
         // and https://github.com/rust-lang/rfcs/blob/master/text/2420-unreserve-proc.md
-        | "abstract" | "as" | "become" | "box" | "break" | "const"
-        | "continue" | "crate" | "do" | "else" | "enum" | "extern" | "false" | "final"
-        | "fn" | "for" | "if" | "impl" | "in" | "let" | "loop" | "macro" | "match"
-        | "mod" | "move" | "mut" | "override" | "priv" | "pub"
-        | "ref" | "return" | "Self" | "self" | "static" | "struct"
-        | "super" | "trait" | "true" | "type" | "typeof" | "unsafe" | "unsized" | "use"
-        | "virtual" | "where" | "while" | "yield" => false,
+        "abstract" | "as" | "become" | "box" | "break" | "const" | "continue" |
+        "crate" | "do" | "else" | "enum" | "extern" | "false" | "final" | "fn" |
+        "for" | "if" | "impl" | "in" | "let" | "loop" | "macro" | "match" |
+        "mod" | "move" | "mut" | "override" | "priv" | "pub" | "ref" |
+        "return" | "Self" | "self" | "static" | "struct" | "super" | "trait" |
+        "true" | "type" | "typeof" | "unsafe" | "unsized" | "use" | "virtual" |
+        "where" | "while" | "yield" => false,
         _ => true,
     }
 }