mirror of https://github.com/rust-lang/rust
67 lines
1.4 KiB
Rust
67 lines
1.4 KiB
Rust
//@ test-mir-pass: UnreachablePropagation
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// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
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enum Empty {}
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fn empty() -> Option<Empty> {
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None
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}
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// EMIT_MIR unreachable.if_let.UnreachablePropagation.diff
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fn if_let() {
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// CHECK-LABEL: fn if_let(
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// CHECK: bb0: {
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// CHECK: {{_.*}} = empty()
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// CHECK: bb1: {
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// CHECK: [[ne:_.*]] = Ne({{.*}}, const 1_isize);
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// CHECK-NEXT: assume(move [[ne]]);
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// CHECK-NEXT: goto -> bb6;
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// CHECK: bb2: {
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// CHECK-NEXT: unreachable;
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// CHECK: bb3: {
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// CHECK-NEXT: unreachable;
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// CHECK: bb4: {
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// CHECK-NEXT: unreachable;
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// CHECK: bb5: {
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// CHECK-NEXT: unreachable;
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// CHECK: bb6: {
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// CHECK: return;
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if let Some(_x) = empty() {
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let mut _y;
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if true {
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_y = 21;
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} else {
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_y = 42;
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}
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match _x { }
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}
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}
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// EMIT_MIR unreachable.as_match.UnreachablePropagation.diff
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fn as_match() {
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// CHECK-LABEL: fn as_match(
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// CHECK: bb0: {
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// CHECK: {{_.*}} = empty()
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// CHECK: bb1: {
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// CHECK: [[eq:_.*]] = Eq({{.*}}, const 0_isize);
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// CHECK-NEXT: assume(move [[eq]]);
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// CHECK-NEXT: goto -> bb4;
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// CHECK: bb2: {
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// CHECK-NEXT: unreachable;
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// CHECK: bb3: {
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// CHECK-NEXT: unreachable;
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// CHECK: bb4: {
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// CHECK: return;
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match empty() {
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None => {}
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Some(_x) => match _x {}
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}
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}
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fn main() {
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if_let();
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as_match();
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}
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