Fixed loose error

parser/src/grammar.pest

@@ -497,13 +497,13 @@ as_px = {
 range_end_inc_px = { "..=" }
 range_end_exc_px = { ".." }
 
-increment_px = { "++" }
-decrement_px = { "++" }
+inc_px = { "++" }
+dec_px = { "++" }
 
 postfix = {
     field_px
-  | increment_px
-  | decrement_px
+  | inc_px
+  | dec_px
   | call_px
   | macro_call_px
   | struct_px

parser/src/lib.rs

@@ -41,7 +41,7 @@ macro_rules! ast_ensure {
             Err(AstError {
                 span: $pair.as_span(),
                 error_code: crate::error::ErrorCode::AstGenBug,
-                error_message: format!("Possible bug: expected {:?}, got {}", $rule, $pair),
+                error_message: format!("Possible bug: expected {:?}, got {:?}", $rule, $pair.as_rule()),
                 recovered: None,
             })
         }
@@ -50,6 +50,16 @@ macro_rules! ast_ensure {
 
 #[macro_export]
 macro_rules! ast_expr {
+    (use $r:expr, $($v:expr),* $(,)?) => {{
+        let mut analyzer = $crate::error::AstErrorAnalyzer(None);
+
+        $(
+            analyzer.get($v).get()?;
+        )*
+
+        analyzer.build($r)
+    }};
+
     ($($item:ident)::+ { $($k:ident: $v:expr),* $(,)? }) => {{
         let mut analyzer = $crate::error::AstErrorAnalyzer(None);
 

parser/src/parser/common/expr.rs

@@ -101,7 +101,7 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Expression {
                         postfixes: postfixes,
                     })
                 } else {
-                    exp
+                    ast_expr!(use exp?, prefixes, postfixes)
                 }
             }