refactor: Restore quote_spanned! in accounts.rs for better error messages

Signed-off-by: AvhiMaz <avhimazumder5@outlook.com>

Author: AvhiMaz

lang/syn/src/codegen/program/accounts.rs

@@ -1,9 +1,11 @@
 use crate::Program;
 use heck::SnakeCase;
-use quote::quote;
+use quote::{quote, quote_spanned};
+use syn::spanned::Spanned;
 
 pub fn generate(program: &Program) -> proc_macro2::TokenStream {
     let mut accounts = std::collections::HashMap::new();
+    let mut ix_spans = std::collections::HashMap::new();
 
     // Go through instruction accounts.
     for ix in &program.ixs {
@@ -13,6 +15,7 @@ pub fn generate(program: &Program) -> proc_macro2::TokenStream {
             "__client_accounts_{}",
             anchor_ident.to_string().to_snake_case()
         );
+        ix_spans.insert(macro_name.clone(), ix.raw_method.span());
         accounts.insert(macro_name, ix.cfgs.as_slice());
     }
 
@@ -21,7 +24,11 @@ pub fn generate(program: &Program) -> proc_macro2::TokenStream {
         .iter()
         .map(|(macro_name_str, cfgs)| {
             let macro_name: proc_macro2::TokenStream = macro_name_str.parse().unwrap();
-            quote! {
+            let ix_span = ix_spans
+                .get(macro_name_str)
+                .copied()
+                .unwrap_or_else(proc_macro2::Span::call_site);
+            quote_spanned! { ix_span =>
                 #(#cfgs)*
                 pub use crate::#macro_name::*;
             }