🐛 fix segfault in `var x = (var a,b) = (1,2)`

src/nasal_parse.cpp

@@ -118,6 +118,10 @@ bool parse::check_tuple() {
 }
 
 bool parse::check_func_end(expr* node) {
+    // avoid error parse caused nullptr return value
+    if (!node) {
+        return true;
+    }
     auto type = node->get_type();
     if (type==expr_type::ast_func) {
         return true;
@@ -154,6 +158,10 @@ bool parse::check_special_call() {
 }
 
 bool parse::need_semi_check(expr* node) {
+    // avoid error parse caused nullptr return value
+    if (!node) {
+        return true;
+    }
     auto type = node->get_type();
     if (type==expr_type::ast_for ||
         type==expr_type::ast_forei ||
@@ -627,7 +635,9 @@ expr* parse::scalar() {
         return null();
     }
     // check call and avoid ambiguous syntax
-    if (is_call(toks[ptr].type) && !(lookahead(tok::lcurve) && toks[ptr+1].type==tok::var)) {
+    // i don't know why using `&& !(lookahead(tok::lcurve) && toks[ptr+1].type==tok::var)`
+    // here, maybe we'll find the reason XD
+    if (is_call(toks[ptr].type)) {
         auto call_node = new call_expr(toks[ptr].loc);
         call_node->set_first(node);
         while(is_call(toks[ptr].type)) {

tools/repl.nas

@@ -13,6 +13,7 @@ var content = [];
 var log_cache = "";
 
 println("Nasal: This is experimental REPL");
+println("Tips : \";\" is automatically added at the end of the input line.");
 help();
 
 var count_bracket = func(line) {