1 files changed, 7 insertions, 2 deletions

diff --git a/src/yuescript/yue_parser.cpp b/src/yuescript/yue_parser.cpp
index e4de0b5..e755fb2 100644
--- a/src/yuescript/yue_parser.cpp
+++ b/src/yuescript/yue_parser.cpp
@@ -679,10 +679,15 @@ YueParser::YueParser() {
                 advance >> ensure(MultiLineComment >> Space | Comment, PopIndent) |
                 plain_space) >> and_(Break);
 
+        indentation_error = pl::user(not_(PipeOperator), [](const item_t& item) {
+                throw ParserError("unexpected indent", *item.begin, *item.end);
+                return false;
+        });
+
         Line =
                 CheckIndent >> Statement |
-                Advance >> ensure(Space >> and_(PipeOperator) >> Statement, PopIndent) |
-                empty_line_break;
+                empty_line_break |
+                Advance >> ensure(Space >> (indentation_error | Statement), PopIndent);
         Block = Seperator >> Line >> *(+Break >> Line);
 
         Shebang = expr("#!") >> *(not_(Stop) >> Any);