From 2ef2aedebdae38e6bb160e805dc4a7ec6dc13028 Mon Sep 17 00:00:00 2001
From: bit-aloo <sshourya17@gmail.com>
Date: Thu, 8 Jan 2026 22:43:03 +0530
Subject: [PATCH] add comment on incrementality of subrequest

---
 crates/load-cargo/src/lib.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/load-cargo/src/lib.rs b/crates/load-cargo/src/lib.rs
index 904f704221..8342492a33 100644
--- a/crates/load-cargo/src/lib.rs
+++ b/crates/load-cargo/src/lib.rs
@@ -553,6 +553,7 @@ impl ProcMacroExpander for Expander {
 
                 Ok(SubResponse::LocalFilePathResult { name })
             }
+            // Not incremental: requires full file text.
             SubRequest::SourceText { file_id, ast_id, start, end } => {
                 let range = resolve_sub_span(
                     db,
@@ -567,6 +568,7 @@ impl ProcMacroExpander for Expander {
 
                 Ok(SubResponse::SourceTextResult { text })
             }
+            // Not incremental: requires building line index.
             SubRequest::LineColumn { file_id, ast_id, offset } => {
                 let range =
                     resolve_sub_span(db, file_id, ast_id, TextRange::empty(TextSize::from(offset)));
@@ -591,6 +593,7 @@ impl ProcMacroExpander for Expander {
 
                 Ok(SubResponse::FilePathResult { name })
             }
+            // Not incremental: requires global span resolution.
             SubRequest::ByteRange { file_id, ast_id, start, end } => {
                 let range = resolve_sub_span(
                     db,