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fix escape analysis for AST_Yield

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fixes #2565
This commit is contained in:
alexlamsl
2017-12-10 14:25:23 +08:00
parent 7fd4b66eaa
commit f778a0aa01
2 changed files with 41 additions and 1 deletions
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3
lib/compress.js
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@@ -681,7 +681,8 @@ merge(Compressor.prototype, {
if (parent instanceof AST_Assign && parent.operator == "=" && node === parent.right
|| parent instanceof AST_Call && node !== parent.expression
|| parent instanceof AST_Exit && node === parent.value && node.scope !== d.scope
|| parent instanceof AST_VarDef && node === parent.value) {
|| parent instanceof AST_VarDef && node === parent.value
|| parent instanceof AST_Yield && node === parent.value && node.scope !== d.scope) {
d.escaped = true;
return;
} else if (parent instanceof AST_Array

39
test/compress/reduce_vars.js
View File

@@ -5148,3 +5148,42 @@ issue_2560_6: {
}
expect_stdout: "PASS"
}
escape_yield: {
options = {
reduce_funcs: true,
reduce_vars: true,
toplevel: true,
unused: true,
}
input: {
function main() {
var thing = gen.next().value;
if (thing !== (thing = gen.next().value))
console.log("FAIL");
else
console.log("PASS");
}
function foo() {}
function* baz(s) {
for (;;) yield foo;
}
var gen = baz();
main();
}
expect: {
function foo() {}
var gen = function*(s) {
for (;;) yield foo;
}();
(function() {
var thing = gen.next().value;
if (thing !== (thing = gen.next().value))
console.log("FAIL");
else
console.log("PASS");
})();
}
expect_stdout: "PASS"
node_version: ">=4"
}