diff options
| -rw-r--r-- | lib/compress.js | 4 | ||||
| -rw-r--r-- | test/compress/drop-unused.js | 25 |
2 files changed, 28 insertions, 1 deletions
diff --git a/lib/compress.js b/lib/compress.js index a8bf0d9d..f7fedeb2 100644 --- a/lib/compress.js +++ b/lib/compress.js @@ -3737,7 +3737,9 @@ merge(Compressor.prototype, { def.value = null; head.push(def); } else { - var value = def.value && def.value.drop_side_effect_free(compressor); + var value = def.value + && (sym.references.length != 1 || !sym.replaced) + && def.value.drop_side_effect_free(compressor); if (value) { AST_Node.warn("Side effects in initialization of unused variable {name} [{file}:{line},{col}]", template(def.name)); side_effects.push(value); diff --git a/test/compress/drop-unused.js b/test/compress/drop-unused.js index 942762f9..833b8c61 100644 --- a/test/compress/drop-unused.js +++ b/test/compress/drop-unused.js @@ -2102,3 +2102,28 @@ issue_3497: { } expect_stdout: "undefined" } + +issue_3515: { + options = { + collapse_vars: true, + reduce_vars: true, + unused: true, + } + input: { + var c = 0; + (function() { + this[c++] = 0; + var expr20 = !0; + for (var key20 in expr20); + })(); + console.log(c); + } + expect: { + var c = 0; + (function() { + for (var key20 in !(this[c++] = 0)); + })(); + console.log(c); + } + expect_stdout: "1" +} |