Add diagnostic for calling non-bwd-diff func from bwd-diff func. (#2602)

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/diagnostics/autodiff-data-flow-2.slang.expected b/tests/diagnostics/autodiff-data-flow-2.slang.expected
new file mode 100644
index 000000000..9026c0748
--- /dev/null
+++ b/tests/diagnostics/autodiff-data-flow-2.slang.expected
@@ -0,0 +1,8 @@
+result code = -1
+standard error = {
+tests/diagnostics/autodiff-data-flow-2.slang(18): error 41020: derivative cannot be propagated through call to non-backward-differentiable function `f`, use 'no_diff' to clarify intention.
+    float val = f(x + 1); // Error: f must also be backward-differentiable
+                 ^
+}
+standard output = {
+}