Use callbacks properly

Author: igelado

bindgen/ir/var.rs

@@ -427,10 +427,10 @@ fn parse_macro(
 ) -> Option<(Vec<u8>, cexpr::expr::EvalResult)> {
     use cexpr::expr;
 
-    let cexpr_tokens = cursor.cexpr_tokens();
+    let mut cexpr_tokens = cursor.cexpr_tokens();
 
-    if let Some(callbacks) = ctx.options.parse_callbacks() {
-        callbacks.modify_macro(cursor.spelling(), &mut cexpr_tokens);
+    for callbacks in &ctx.options().parse_callbacks {
+        callbacks.modify_macro(&cursor.spelling(), &mut cexpr_tokens);
     }
 
     let parser = expr::IdentifierParser::new(ctx.parsed_macros());