diff options
Diffstat (limited to 'lib/compress.js')
| -rw-r--r-- | lib/compress.js | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/lib/compress.js b/lib/compress.js index 3f9678a7..22f4736a 100644 --- a/lib/compress.js +++ b/lib/compress.js @@ -6562,10 +6562,25 @@ merge(Compressor.prototype, { if (def.orig.length > 1) return null; if (def.assignments > 0) return false; if (def.name == name) return def; - if (name == "await" && is_async(fn)) return false; - if (name == "yield" && is_generator(fn)) return false; + var forbidden; + switch (name) { + case "await": + forbidden = is_async; + break; + case "yield": + forbidden = is_generator; + break; + } return all(def.references, function(ref) { - return ref.scope.find_variable(name) === sym; + var scope = ref.scope; + if (scope.find_variable(name) !== sym) return false; + if (forbidden) { + scope = scope.resolve(); + do { + if (forbidden(scope)) return false; + } while ((scope = scope.parent_scope.resolve()) && scope !== fn); + } + return true; }) && def; } |