if (parent instanceof AST_SimpleStatement) return find_stop_unused(parent, level + 1);
if (parent instanceof AST_Switch) return find_stop_unused(parent, level + 1);
if (parent instanceof AST_Unary) return find_stop_unused(parent, level + 1);
- if (parent instanceof AST_VarDef) return find_stop_unused(parent, level + 1);
+ if (parent instanceof AST_VarDef) {
+ return may_throw(parent) ? node : find_stop_unused(parent, level + 1);
+ }
return null;
}
}
}
} else if (self.left instanceof AST_SymbolRef) {
- if (self.operator == "=" && self.left.equivalent_to(self.right)) return self.right;
+ var parent;
+ if (self.operator == "=" && self.left.equivalent_to(self.right)
+ && !((parent = compressor.parent()) instanceof AST_UnaryPrefix && parent.operator == "delete")) {
+ return self.right;
+ }
if (self.left.is_immutable()) return strip_assignment();
var def = self.left.definition();
var scope = def.scope.resolve();
var local = scope === compressor.find_parent(AST_Lambda);
- var level = 0, node, parent = self;
+ var level = 0, node;
+ parent = self;
do {
node = parent;
parent = compressor.parent(level++);
"NaN",
]
}
+
+issue_4051: {
+ options = {
+ collapse_vars: true,
+ }
+ input: {
+ try {
+ var a = (b = b.p, "FAIL"), b = b;
+ } catch (e) {}
+ console.log(a);
+ }
+ expect: {
+ try {
+ var a = (b = b.p, "FAIL"), b = b;
+ } catch (e) {}
+ console.log(a);
+ }
+ expect_stdout: "undefined"
+}