primops/fromJSON: add error position in case of parse error

This makes it easier to track down where invalid JSON was passed to `builtins.fromJSON`.
2020-12-13 13:55:32 +01:00
parent c6a1bcd0ec
commit f890830b33
1 changed files with 6 additions and 1 deletions
@@ -1621,7 +1621,12 @@ static RegisterPrimOp primop_toJSON({
 static void prim_fromJSON(EvalState & state, const Pos & pos, Value * * args, Value & v)
 {
    string s = state.forceStringNoCtx(*args[0], pos);
-    parseJSON(state, s, v);
+    try {
+        parseJSON(state, s, v);
+    } catch (JSONParseError &e) {
+        e.addTrace(pos, "while decoding a JSON string");
+        throw e;
+    }
 }

 static RegisterPrimOp primop_fromJSON({