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-rw-r--r--tvix/eval/src/vm/generators.rs2
-rw-r--r--tvix/eval/src/warnings.rs7
2 files changed, 8 insertions, 1 deletions
diff --git a/tvix/eval/src/vm/generators.rs b/tvix/eval/src/vm/generators.rs
index f86683dff542..138600be194a 100644
--- a/tvix/eval/src/vm/generators.rs
+++ b/tvix/eval/src/vm/generators.rs
@@ -650,7 +650,7 @@ pub(crate) async fn emit_warning(co: &GenCo, warning: EvalWarning) {
 }
 
 /// Emit a runtime warning with the span of the current generator.
-pub(crate) async fn emit_warning_kind(co: &GenCo, kind: WarningKind) {
+pub async fn emit_warning_kind(co: &GenCo, kind: WarningKind) {
     match co.yield_(VMRequest::EmitWarningKind(kind)).await {
         VMResponse::Empty => {}
         msg => panic!(
diff --git a/tvix/eval/src/warnings.rs b/tvix/eval/src/warnings.rs
index aa567f302755..e007d9c34f2d 100644
--- a/tvix/eval/src/warnings.rs
+++ b/tvix/eval/src/warnings.rs
@@ -17,6 +17,7 @@ pub enum WarningKind {
     DeadCode,
     EmptyInherit,
     EmptyLet,
+    ShadowedOutput(String),
 
     /// Tvix internal warning for features triggered by users that are
     /// not actually implemented yet, but do not cause runtime failures.
@@ -100,6 +101,11 @@ impl EvalWarning {
 
             WarningKind::EmptyLet => "this `let`-expression contains no bindings".to_string(),
 
+            WarningKind::ShadowedOutput(ref out) => format!(
+                "this derivation's environment shadows the output name {}",
+                out
+            ),
+
             WarningKind::NotImplemented(what) => {
                 format!("feature not yet implemented in tvix: {}", what)
             }
@@ -120,6 +126,7 @@ impl EvalWarning {
             WarningKind::DeadCode => "W008",
             WarningKind::EmptyInherit => "W009",
             WarningKind::EmptyLet => "W010",
+            WarningKind::ShadowedOutput(_) => "W011",
 
             WarningKind::NotImplemented(_) => "W999",
         }