51 lines
893 B
Rust
51 lines
893 B
Rust
fn match_ref(&&v: option<int>) -> int {
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alt v {
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some(i) {
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i
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}
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none {0}
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}
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}
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fn match_ref_unused(&&v: option<int>) {
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alt v {
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some(_) {}
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none {}
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}
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}
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fn match_const_reg(v: &const option<int>) -> int {
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alt *v {
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some(i) {i} // OK because this is pure
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none {0}
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}
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}
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fn impure(_i: int) {
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}
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fn match_const_reg_unused(v: &const option<int>) {
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alt *v {
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some(_) {impure(0)} // OK because nothing is captured
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none {}
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}
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}
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fn match_const_reg_impure(v: &const option<int>) {
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alt *v {
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some(i) {impure(i)} //! ERROR illegal borrow unless pure: enum variant in aliasable, mutable location
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//!^ NOTE impure due to access to impure function
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none {}
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}
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}
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fn match_imm_reg(v: &option<int>) {
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alt *v {
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some(i) {impure(i)} // OK because immutable
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none {}
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}
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}
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fn main() {
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}
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