chore(fmt): add legacy stubs and strip trailing whitespace to unblock cargo fmt

src/parser/expr/ternary.rs

@@ -1,10 +1,12 @@
-use crate::parser::{NyashParser, ParseError};
-use crate::parser::common::ParserUtils;
-use crate::tokenizer::TokenType;
 use crate::ast::{ASTNode, Span};
+use crate::parser::common::ParserUtils;
+use crate::parser::{NyashParser, ParseError};
+use crate::tokenizer::TokenType;
 
 #[inline]
-fn is_sugar_enabled() -> bool { crate::parser::sugar_gate::is_enabled() }
+fn is_sugar_enabled() -> bool {
+    crate::parser::sugar_gate::is_enabled()
+}
 
 impl NyashParser {
     pub(crate) fn expr_parse_ternary(&mut self) -> Result<ASTNode, ParseError> {