retain @__PURE__ call when return value is used (#3874)

2020-05-10 18:07:05 +01:00
parent 63adfb1590
commit 7e0ad232b0
2 changed files with 26 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3499,6 +3499,7 @@ merge(Compressor.prototype, {
            if (fn instanceof AST_Lambda) {
                if (fn.evaluating) return this;
                if (fn.name && fn.name.definition().recursive_refs > 0) return this;
+                if (this.is_expr_pure(compressor)) return this;
                var stat = fn.first_statement();
                if (!(stat instanceof AST_Return)) return this;
                var args = eval_args(this.args);