From bd93d31b30e46c9fba71247f55a102aefd99a92d Mon Sep 17 00:00:00 2001
From: Weihang Lo <me@weihanglo.tw>
Date: Tue, 23 Sep 2025 22:11:49 -0400
Subject: [PATCH] fix(config): make it clear which element in list is bad

---
 src/cargo/util/context/mod.rs         | 2 +-
 tests/testsuite/cargo_alias_config.rs | 2 +-
 tests/testsuite/config.rs             | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/cargo/util/context/mod.rs b/src/cargo/util/context/mod.rs
index 4593807c1..006201898 100644
--- a/src/cargo/util/context/mod.rs
+++ b/src/cargo/util/context/mod.rs
@@ -2236,7 +2236,7 @@ impl ConfigValue {
                         toml::Value::String(val) => Ok((val, def.clone())),
                         v => {
                             path.push(KeyOrIdx::Idx(i));
-                            bail!("expected string but found {} in list", v.type_str())
+                            bail!("expected string but found {} at index {i}", v.type_str())
                         }
                     })
                     .collect::<CargoResult<_>>()?,
diff --git a/tests/testsuite/cargo_alias_config.rs b/tests/testsuite/cargo_alias_config.rs
index cc2058dda..044a5a28a 100644
--- a/tests/testsuite/cargo_alias_config.rs
+++ b/tests/testsuite/cargo_alias_config.rs
@@ -90,7 +90,7 @@ Caused by:
   failed to parse config at `alias.b-cargo-test[0]`
 
 Caused by:
-  expected string but found integer in list
+  expected string but found integer at index 0
 
 "#]])
         .run();
diff --git a/tests/testsuite/config.rs b/tests/testsuite/config.rs
index 854094124..ff8bad643 100644
--- a/tests/testsuite/config.rs
+++ b/tests/testsuite/config.rs
@@ -1366,7 +1366,7 @@ Caused by:
   failed to parse config at `foo[0]`
 
 Caused by:
-  expected string but found integer in list
+  expected string but found integer at index 0
 "#]],
     );
 }