evaluate: don't BUG on unexpected base datatype

Included bogon will cause a crash but this is the evaluation stage where
we can just emit an error instead.

Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/evaluate.c b/src/evaluate.c
index 9c7f23cb..872a9e0d 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -482,7 +482,8 @@ static int expr_evaluate_value(struct eval_ctx *ctx, struct expr **expr)
 			return -1;
 		break;
 	default:
-		BUG("invalid basetype %s\n", expr_basetype(*expr)->name);
+		return expr_error(ctx->msgs, *expr, "Unexpected datatype %s",
+				  (*expr)->dtype->name);
 	}
 	return 0;
 }