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fix: for-in 与 for-of 头 var 名补编译期预声明臂

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彭俊皓
2026-09-14 16:14:31 +00:00
parent b00147eff1
commit 99c1254fab
2 changed files with 61 additions and 0 deletions
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crates/oxide_emit/src/prepass.rs
+27
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@@ -442,6 +442,33 @@ impl Emitter {
}
self.predeclare_var_declarations(std::slice::from_ref(&fs.body), ctx);
}
Statement::ForInStatement(fi) => {
// var 头名提升到函数/全局作用域（与 For 臂同规则），先于提升
// 函数声明发射预声明，使函数体按既有 var 绑定解析头名；
// let/const 头是迭代级绑定，不入提升面。
if let oxide_parser::ForStatementLeft::VariableDeclaration(decl) = &fi.left {
if matches!(decl.kind, VariableDeclarationKind::Var) {
for d in &decl.declarations {
if let oxide_parser::BindingPattern::BindingIdentifier(bi) = &d.id {
self.predeclare_var_name(bi.name.as_str(), ctx);
}
}
}
}
self.predeclare_var_declarations(std::slice::from_ref(&fi.body), ctx);
}
Statement::ForOfStatement(fo) => {
if let oxide_parser::ForStatementLeft::VariableDeclaration(decl) = &fo.left {
if matches!(decl.kind, VariableDeclarationKind::Var) {
for d in &decl.declarations {
if let oxide_parser::BindingPattern::BindingIdentifier(bi) = &d.id {
self.predeclare_var_name(bi.name.as_str(), ctx);
}
}
}
}
self.predeclare_var_declarations(std::slice::from_ref(&fo.body), ctx);
}
Statement::SwitchStatement(sw) => {
for case in &sw.cases {
self.predeclare_var_declarations(&case.consequent, ctx);