Fixups after merge

lib/ast.js

@@ -294,6 +294,13 @@ var AST_Scope = DEFNODE("Scope", "is_block_scope directives variables functions
         parent_scope: "[AST_Scope?/S] link to the parent scope",
         enclosed: "[SymbolDef*/S] a list of all symbol definitions that are accessed from this scope or any subscopes",
         cname: "[integer/S] current index for mangling variables (used internally by the mangler)",
+    },
+    get_defun_scope: function () {
+        var self = this;
+        while (self.is_block_scope && self.parent_scope) {
+            self = self.parent_scope;
+        }
+        return self;
     }
 }, AST_Block);
 

lib/compress.js

@@ -323,7 +323,7 @@ merge(Compressor.prototype, {
                     if (side_effects_encountered |= lvalues_encountered) continue;
 
                     // Non-constant single use vars can only be replaced in same scope.
-                    if (ref.scope !== self) {
+                    if (ref.scope.get_defun_scope() !== self) {
                         side_effects_encountered |= var_decl.value.has_side_effects(compressor);
                         continue;
                     }

test/compress/block-scope.js

@@ -117,13 +117,13 @@ regression_block_scope_resolves: {
     expect: {
         (function () {
             if (1) {
-                let a;
-                const b;
+                let o;
+                const n;
                 class c {};
             }
             if (1) {
-                let a;
-                const b;
+                let o;
+                const n;
                 class c {};
             }
             console.log(x, y, Zee, ex, why, Zi);

test/compress/harmony.js

@@ -62,9 +62,9 @@ shorthand_properties: {
         return value;
     })();
     expect: (function() {
-        var a = 1;
-        const b = {prop:a};
-        return b;
+        var n = 1;
+        const r = {prop:n};
+        return r;
     })();
 }
 
@@ -271,8 +271,8 @@ class_name_can_be_mangled: {
     expect: {
         function x() {
             class a { }
-            var b = a
-            var c = class a {}
+            var n = a
+            var r = class a {}
         }
     }
 }
@@ -354,13 +354,13 @@ import_statement_mangling: {
         Whatever();
     }
     expect: {
-        import a from "foo";
-        import b, {Food as c} from "lel";
-        import {What as d} from "lel";
-        a();
-        b();
-        c();
-        d();
+        import l from "foo";
+        import e, {Food as o} from "lel";
+        import {What as f} from "lel";
+        l();
+        e();
+        o();
+        f();
     }
 }