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fix corner case in dead_code & ie8 (#3494)

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fixes #3493
This commit is contained in:
Alex Lam S.L
2019-10-17 09:58:05 +08:00
committed by GitHub
parent b1279a46d9
commit 0785a15ace
2 changed files with 76 additions and 2 deletions
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6
lib/compress.js
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@@ -888,8 +888,10 @@ merge(Compressor.prototype, {
});
AST_SymbolRef.DEFMETHOD("is_immutable", function() {
var orig = this.definition().orig;
return orig.length == 1 && orig[0] instanceof AST_SymbolLambda;
var def = this.definition();
if (def.orig.length != 1) return false;
var sym = def.orig[0];
return sym instanceof AST_SymbolLambda && def.scope.name === sym;
});
function is_lhs_read_only(lhs, compressor) {

72
test/compress/ie8.js
View File

@@ -1887,3 +1887,75 @@ issue_3486_ie8: {
}
expect_stdout: "PASS"
}
issue_3493: {
options = {
dead_code: true,
ie8: false,
}
input: {
var c = "PASS";
(function() {
try {
(function a() {
throw {};
})();
} catch (a) {
a >>= 0;
a && (c = "FAIL");
}
})();
console.log(c);
}
expect: {
var c = "PASS";
(function() {
try {
(function a() {
throw {};
})();
} catch (a) {
a >>= 0;
a && (c = "FAIL");
}
})();
console.log(c);
}
expect_stdout: "PASS"
}
issue_3493_ie8: {
options = {
dead_code: true,
ie8: true,
}
input: {
var c = "PASS";
(function() {
try {
(function a() {
throw {};
})();
} catch (a) {
a >>= 0;
a && (c = "FAIL");
}
})();
console.log(c);
}
expect: {
var c = "PASS";
(function() {
try {
(function a() {
throw {};
})();
} catch (a) {
a >>= 0;
a && (c = "FAIL");
}
})();
console.log(c);
}
expect_stdout: "PASS"
}