bpo-39890: Don't mutate the AST when compiling starred assignments (GH-18833)
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@ -3765,7 +3765,6 @@ assignment_helper(struct compiler *c, asdl_seq *elts)
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"star-unpacking assignment");
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ADDOP_I(c, UNPACK_EX, (i + ((n-i-1) << 8)));
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seen_star = 1;
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asdl_seq_SET(elts, i, elt->v.Starred.value);
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}
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else if (elt->kind == Starred_kind) {
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return compiler_error(c,
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@ -3775,7 +3774,10 @@ assignment_helper(struct compiler *c, asdl_seq *elts)
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if (!seen_star) {
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ADDOP_I(c, UNPACK_SEQUENCE, n);
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}
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VISIT_SEQ(c, expr, elts);
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for (i = 0; i < n; i++) {
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expr_ty elt = asdl_seq_GET(elts, i);
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VISIT(c, expr, elt->kind != Starred_kind ? elt : elt->v.Starred.value);
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}
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return 1;
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}
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