collapse a.b whenever safe (#2350)

2017-10-08 13:17:48 +08:00
parent 6920e898d1
commit 1abe14296e
2 changed files with 70 additions and 3 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -812,7 +812,7 @@ merge(Compressor.prototype, {
                        var sym;
                        if (node instanceof AST_Call
                            || node instanceof AST_Exit
-                            || node instanceof AST_PropAccess
+                            || node instanceof AST_PropAccess && node.has_side_effects(compressor)
                            || node instanceof AST_SymbolRef
                               && (lvalues[node.name]
                                   || side_effects && !references_in_scope(node.definition()))