fix ExportsInfo

lib/ExportsInfo.js

@@ -584,7 +584,7 @@ class ExportsInfo {
 			if (info.exportsInfo && name.length > 1) {
 				return info.exportsInfo.isExportProvided(name.slice(1));
 			}
-			return info.provided;
+			return info.provided ? name.length === 1 || undefined : info.provided;
 		}
 		const info = this.getReadOnlyExportInfo(name);
 		return info.provided;

test/cases/parsing/harmony-export-import-specifier/index.js

@@ -6,6 +6,7 @@ import { b1, usedB1, usedB2, usedB3, usedB4 } from "./b.js";
 import { usedE1, usedE2 } from "./e.js";
 import { h } from "./h.js";
 import * as m from "./m";
+import {object as obj} from "./m";
 import * as o from "./o";
 import * as p from "./p";
 import * as q from "./q";
@@ -45,6 +46,8 @@ it("complex case should work correctly", () => {
 it("should handle 'm in n' case", () => {
 	const obj = { aaa: "aaa" in m };
 	expect(obj.aaa).toBe(true);
+	expect("not_here" in m.object).toBe(false);
+	expect("not_here" in obj).toBe(false);
 	expect("aaa" in o).toBe(true);
 	expect("aaa" in p).toBe(false);
 	expect("ccc" in m).toBe(false);

test/cases/parsing/harmony-export-import-specifier/m.js

@@ -1,5 +1,6 @@
 export const aaa = 1;
 export const bbb = 2;
+export const object = {};
 export * as ddd from "./n";
 export const usedA = __webpack_exports_info__.aaa.used;
 export const canMangleA = __webpack_exports_info__.ccc.canMangle;