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drop unused compound assignments (#2230)

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fixes #2226
This commit is contained in:
Alex Lam S.L
2017-07-14 00:39:34 +08:00
committed by GitHub
parent 458e3e15f0
commit 5229cb2b1b
3 changed files with 118 additions and 21 deletions
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90
test/compress/drop-unused.js
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@@ -1090,6 +1090,7 @@ var_catch_toplevel: {
a--;
try {
a++;
x();
} catch(a) {
if (a) var a;
var a = 10;
@@ -1099,9 +1100,8 @@ var_catch_toplevel: {
}
expect: {
!function() {
a--;
try {
a++;
x();
} catch(a) {
var a;
}
@@ -1153,3 +1153,89 @@ issue_2105: {
}
expect_stdout: "PASS"
}
issue_2226_1: {
options = {
side_effects: true,
unused: true,
}
input: {
function f1() {
var a = b;
a += c;
}
function f2(a) {
a <<= b;
}
function f3(a) {
--a;
}
function f4() {
var a = b;
return a *= c;
}
function f5(a) {
x(a /= b);
}
}
expect: {
function f1() {
b;
c;
}
function f2(a) {
b;
}
function f3(a) {
0;
}
function f4() {
var a = b;
return a *= c;
}
function f5(a) {
x(a /= b);
}
}
}
issue_2226_2: {
options = {
cascade: true,
sequences: true,
side_effects: true,
unused: true,
}
input: {
console.log(function(a, b) {
a += b;
return a;
}(1, 2));
}
expect: {
console.log(function(a, b) {
return a += b;
}(1, 2));
}
expect_stdout: "3"
}
issue_2226_3: {
options = {
collapse_vars: true,
side_effects: true,
unused: true,
}
input: {
console.log(function(a, b) {
a += b;
return a;
}(1, 2));
}
expect: {
console.log(function(a, b) {
return a += 2;
}(1));
}
expect_stdout: "3"
}