gh-165: Make IN reject non-TNS tensor.

python-processing-unit · python-processing-unit · commit 3b4f8590cadf · 2026-05-08T17:28:05.000-04:00
diff --git a/src/builtins.c b/src/builtins.c
@@ -5392,9 +5392,9 @@ static Value builtin_in(Interpreter* interp, Value* args, int argc, Expr** arg_n
         RUNTIME_ERROR(interp, "IN requires two arguments", line, col);
     }
 
-    // Container must be a tensor; otherwise membership is false
+    // Container must be a tensor; otherwise this is a runtime error per spec
     if (args[1].type != VAL_TNS) {
-        return value_bool(false);
+        RUNTIME_ERROR(interp, "IN expects TNS as second argument", line, col);
     }
 
     Tensor* t = args[1].as.tns;

Original file line number	Diff line number	Diff line change
`@@ -5392,9 +5392,9 @@ static Value builtin_in(Interpreter* interp, Value* args, int argc, Expr** arg_n`
`5392`	`5392`	`RUNTIME_ERROR(interp, "IN requires two arguments", line, col);`
`5393`	`5393`	`}`
`5394`	`5394`
`5395`		`- // Container must be a tensor; otherwise membership is false`
	`5395`	`+ // Container must be a tensor; otherwise this is a runtime error per spec`
`5396`	`5396`	`if (args[1].type != VAL_TNS) {`
`5397`		`- return value_bool(false);`
	`5397`	`+ RUNTIME_ERROR(interp, "IN expects TNS as second argument", line, col);`
`5398`	`5398`	`}`
`5399`	`5399`
`5400`	`5400`	`Tensor* t = args[1].as.tns;`