Add allow_shadowing.

2022-02-04 13:20:47 +08:00
parent 6c1c8bc538
commit 3be27746e0
7 changed files with 65 additions and 14 deletions
--- a/src/eval/stmt.rs
+++ b/src/eval/stmt.rs
@@ -802,9 +802,14 @@ impl Engine {
            // Empty return
            Stmt::Return(_, None, pos) => Err(ERR::Return(Dynamic::UNIT, *pos).into()),

+            // Let/const statement - shadowing disallowed
+            Stmt::Var(_, x, _, pos) if !self.allow_shadowing() && scope.contains(&x.name) => {
+                Err(ERR::ErrorVariableExists(x.name.to_string(), *pos).into())
+            }
            // Let/const statement
            Stmt::Var(expr, x, options, _) => {
                let var_name = &x.name;
+
                let entry_type = if options.contains(AST_OPTION_CONSTANT) {
                    AccessMode::ReadOnly
                } else {