mirror of https://github.com/rust-lang/rust.git
81 lines
2.4 KiB
Rust
81 lines
2.4 KiB
Rust
//@ test-mir-pass: SingleUseConsts
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//@ compile-flags: -C debuginfo=full
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// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
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trait MyTrait {
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const ASSOC_BOOL: bool;
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const ASSOC_INT: i32;
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}
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// EMIT_MIR single_use_consts.if_const.SingleUseConsts.diff
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fn if_const<T: MyTrait>() -> i32 {
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// CHECK-LABEL: fn if_const(
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// CHECK: switchInt(const <T as MyTrait>::ASSOC_BOOL)
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if T::ASSOC_BOOL { 7 } else { 42 }
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}
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// EMIT_MIR single_use_consts.match_const.SingleUseConsts.diff
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fn match_const<T: MyTrait>() -> &'static str {
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// CHECK-LABEL: fn match_const(
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// CHECK: switchInt(const <T as MyTrait>::ASSOC_INT)
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match T::ASSOC_INT {
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7 => "hello",
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42 => "towel",
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_ => "world",
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}
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}
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// EMIT_MIR single_use_consts.if_const_debug.SingleUseConsts.diff
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fn if_const_debug<T: MyTrait>() -> i32 {
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// CHECK-LABEL: fn if_const_debug(
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// CHECK: my_bool => const <T as MyTrait>::ASSOC_BOOL;
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// FIXME: `if` forces a temporary (unlike `match`), so the const isn't direct
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// CHECK: _3 = const <T as MyTrait>::ASSOC_BOOL;
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// CHECK: switchInt(move _3)
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let my_bool = T::ASSOC_BOOL;
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do_whatever();
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if my_bool { 7 } else { 42 }
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}
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// EMIT_MIR single_use_consts.match_const_debug.SingleUseConsts.diff
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fn match_const_debug<T: MyTrait>() -> &'static str {
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// CHECK-LABEL: fn match_const_debug(
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// CHECK: my_int => const <T as MyTrait>::ASSOC_INT;
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// CHECK: switchInt(const <T as MyTrait>::ASSOC_INT)
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let my_int = T::ASSOC_INT;
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do_whatever();
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match my_int {
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7 => "hello",
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42 => "towel",
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_ => "world",
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}
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}
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// EMIT_MIR single_use_consts.never_used_debug.SingleUseConsts.diff
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#[allow(unused_variables)]
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fn never_used_debug<T: MyTrait>() {
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// CHECK-LABEL: fn never_used_debug(
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// CHECK: my_int => const <T as MyTrait>::ASSOC_INT;
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// CHECK-NOT: ASSOC_INT
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// CHECK: nop
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// CHECK-NOT: ASSOC_INT
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let my_int = T::ASSOC_INT;
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}
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// EMIT_MIR single_use_consts.assign_const_to_return.SingleUseConsts.diff
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fn assign_const_to_return<T: MyTrait>() -> bool {
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// CHECK-LABEL: fn assign_const_to_return(
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// CHECK: _0 = const <T as MyTrait>::ASSOC_BOOL;
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T::ASSOC_BOOL
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}
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// EMIT_MIR single_use_consts.keep_parameter.SingleUseConsts.diff
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fn keep_parameter<T: MyTrait>(mut other: i32) {
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// CHECK-LABEL: fn keep_parameter(
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// CHECK: _1 = const <T as MyTrait>::ASSOC_INT;
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// CHECK: _0 = const ();
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other = T::ASSOC_INT;
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}
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fn do_whatever() {}
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