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fix corner case in unused (#3963)

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fixes #3962
This commit is contained in:
Alex Lam S.L
2020-06-07 06:48:29 +01:00
committed by GitHub
parent 02e889e449
commit aa37b19698
2 changed files with 66 additions and 1 deletions
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2
lib/compress.js
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@@ -4521,7 +4521,7 @@ merge(Compressor.prototype, {
var index = indexOf_assign(sym, def);
if (index >= 0) assign_in_use[sym.id][index] = assign;
sym.eliminated++;
return assign.transform(tt);
return assign;
}));
} else if (head.length > 0 || tail.length > 0) {
node.definitions = head.concat(tail);

65
test/compress/drop-unused.js
View File

@@ -2690,3 +2690,68 @@ issue_3956: {
"1",
]
}
issue_3962_1: {
options = {
evaluate: true,
keep_fargs: "strict",
reduce_vars: true,
toplevel: true,
unused: true,
}
input: {
var a = 0;
function f(b, c) {
do {
var d = console + e, e = 0..toString() === b;
} while (0);
if (c) console.log("PASS");
}
var a = f(a--, 1);
a;
}
expect: {
var a = 0;
a = (function(c) {
do {
console;
0..toString();
} while (0);
if (c) console.log("PASS");
})((a--, 1));
void 0;
}
expect_stdout: "PASS"
}
issue_3962_2: {
options = {
keep_fargs: "strict",
reduce_vars: true,
side_effects: true,
toplevel: true,
unused: true,
}
input: {
var a = 0;
function f(b, c) {
do {
var d = console + e, e = 0..toString() === b;
} while (0);
if (c) console.log("PASS");
}
var a = f(a--, 1);
a;
}
expect: {
var a = 0;
a = (function(c) {
do {
console;
0..toString();
} while (0);
if (c) console.log("PASS");
})((a--, 1));
}
expect_stdout: "PASS"
}