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-rw-r--r--tvix/eval/src/builtins/mod.rs9
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.nix1
3 files changed, 7 insertions, 4 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index 554fc9d7e329..27b7d5648f48 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -1002,10 +1002,11 @@ mod pure_builtins {
         let beg = start.as_int()?;
         let len = len.as_int()?;
         let span = generators::request_span(&co).await;
-        let x = s
-            .coerce_to_string(co, CoercionKind::Weak, span)
-            .await?
-            .to_str()?;
+        let x = s.coerce_to_string(co, CoercionKind::Weak, span).await?;
+        if x.is_catchable() {
+            return Ok(x);
+        }
+        let x = x.to_str()?;
 
         if beg < 0 {
             return Err(ErrorKind::IndexOutOfBounds { index: beg });
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.exp
new file mode 100644
index 000000000000..c508d5366f70
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.exp
@@ -0,0 +1 @@
+false
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.nix
new file mode 100644
index 000000000000..c5a6f5a8203c
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-substring-propagate-catchables.nix
@@ -0,0 +1 @@
+(builtins.tryEval (  builtins.substring 0 4 (throw "jill") )).success