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JakobDegenJakobDegen
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Correct the unsoundness in the EarlyOtherwiseBranch mir opt
This optimization pass previously made excessive assumptions as to the nature of the blocks being optimized. We remove those assumptions and make sure to rigorously justify all changes that are made to the MIR. Details can be found in the file.
1 parent 229d0a9 commit 709c94a

10 files changed

+421
-371
lines changed

‎compiler/rustc_mir_transform/src/early_otherwise_branch.rs‎

Lines changed: 307 additions & 274 deletions
Large diffs are not rendered by default.

‎src/test/mir-opt/early_otherwise_branch.opt1.EarlyOtherwiseBranch.diff‎

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -12,8 +12,8 @@
1212
let mut _7: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:5:10: 5:17
1313
let _8: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:5:15: 5:16
1414
let _9: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:5:24: 5:25
15-
+ let mut _10: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:5:19: 5:26
16-
+ let mut _11: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:5:19: 5:26
15+
+ let mut _10: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
16+
+ let mut _11: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
1717
scope 1 {
1818
debug a => _8; // in scope 1 at $DIR/early_otherwise_branch.rs:5:15: 5:16
1919
debug b => _9; // in scope 1 at $DIR/early_otherwise_branch.rs:5:24: 5:25
@@ -34,7 +34,7 @@
3434
+ StorageLive(_10); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
3535
+ _10 = discriminant((_3.1: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
3636
+ StorageLive(_11); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
37-
+ _11 = Ne(_10, _7); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
37+
+ _11 = Ne(_7, move _10); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
3838
+ StorageDead(_10); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
3939
+ switchInt(move _11) -> [false: bb4, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
4040
}
@@ -70,8 +70,8 @@
7070
+ }
7171
+
7272
+ bb4: {
73-
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:5:19: 5:26
74-
+ switchInt(_7) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:5:19: 5:26
73+
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
74+
+ switchInt(_7) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:4:5: 4:17
7575
}
7676
}
7777

‎src/test/mir-opt/early_otherwise_branch.opt2.EarlyOtherwiseBranch.diff‎

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -13,8 +13,8 @@
1313
let mut _8: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:13:10: 13:17
1414
let _9: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:13:15: 13:16
1515
let _10: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:13:24: 13:25
16-
+ let mut _11: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:14:16: 14:20
17-
+ let mut _12: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:14:16: 14:20
16+
+ let mut _11: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
17+
+ let mut _12: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
1818
scope 1 {
1919
debug a => _9; // in scope 1 at $DIR/early_otherwise_branch.rs:13:15: 13:16
2020
debug b => _10; // in scope 1 at $DIR/early_otherwise_branch.rs:13:24: 13:25
@@ -35,7 +35,7 @@
3535
+ StorageLive(_11); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
3636
+ _11 = discriminant((_3.1: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
3737
+ StorageLive(_12); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
38-
+ _12 = Ne(_11, _8); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
38+
+ _12 = Ne(_8, move _11); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
3939
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
4040
+ switchInt(move _12) -> [false: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
4141
}
@@ -84,8 +84,8 @@
8484
+ }
8585
+
8686
+ bb5: {
87-
+ StorageDead(_12); // scope 0 at $DIR/early_otherwise_branch.rs:14:16: 14:20
88-
+ switchInt(_8) -> [0_isize: bb3, 1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:14:16: 14:20
87+
+ StorageDead(_12); // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
88+
+ switchInt(_8) -> [0_isize: bb3, 1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:12:5: 12:17
8989
}
9090
}
9191

‎src/test/mir-opt/early_otherwise_branch.opt3.EarlyOtherwiseBranch.diff‎

Lines changed: 77 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,77 @@
1+
- // MIR for `opt3` before EarlyOtherwiseBranch
2+
+ // MIR for `opt3` after EarlyOtherwiseBranch
3+
4+
fn opt3(_1: Option<u32>, _2: Option<bool>) -> u32 {
5+
debug x => _1; // in scope 0 at $DIR/early_otherwise_branch.rs:21:9: 21:10
6+
debug y => _2; // in scope 0 at $DIR/early_otherwise_branch.rs:21:25: 21:26
7+
let mut _0: u32; // return place in scope 0 at $DIR/early_otherwise_branch.rs:21:45: 21:48
8+
let mut _3: (std::option::Option<u32>, std::option::Option<bool>); // in scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
9+
let mut _4: std::option::Option<u32>; // in scope 0 at $DIR/early_otherwise_branch.rs:22:12: 22:13
10+
let mut _5: std::option::Option<bool>; // in scope 0 at $DIR/early_otherwise_branch.rs:22:15: 22:16
11+
let mut _6: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:23:19: 23:26
12+
let mut _7: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:23:10: 23:17
13+
let _8: u32; // in scope 0 at $DIR/early_otherwise_branch.rs:23:15: 23:16
14+
let _9: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:23:24: 23:25
15+
+ let mut _10: isize; // in scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
16+
+ let mut _11: bool; // in scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
17+
scope 1 {
18+
debug a => _8; // in scope 1 at $DIR/early_otherwise_branch.rs:23:15: 23:16
19+
debug b => _9; // in scope 1 at $DIR/early_otherwise_branch.rs:23:24: 23:25
20+
}
21+
22+
bb0: {
23+
StorageLive(_3); // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
24+
StorageLive(_4); // scope 0 at $DIR/early_otherwise_branch.rs:22:12: 22:13
25+
_4 = _1; // scope 0 at $DIR/early_otherwise_branch.rs:22:12: 22:13
26+
StorageLive(_5); // scope 0 at $DIR/early_otherwise_branch.rs:22:15: 22:16
27+
_5 = _2; // scope 0 at $DIR/early_otherwise_branch.rs:22:15: 22:16
28+
(_3.0: std::option::Option<u32>) = move _4; // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
29+
(_3.1: std::option::Option<bool>) = move _5; // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
30+
StorageDead(_5); // scope 0 at $DIR/early_otherwise_branch.rs:22:16: 22:17
31+
StorageDead(_4); // scope 0 at $DIR/early_otherwise_branch.rs:22:16: 22:17
32+
_7 = discriminant((_3.0: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
33+
- switchInt(move _7) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
34+
+ StorageLive(_10); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
35+
+ _10 = discriminant((_3.1: std::option::Option<bool>)); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
36+
+ StorageLive(_11); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
37+
+ _11 = Ne(_7, move _10); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
38+
+ StorageDead(_10); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
39+
+ switchInt(move _11) -> [false: bb4, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
40+
}
41+
42+
bb1: {
43+
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:24:14: 24:15
44+
_0 = const 1_u32; // scope 0 at $DIR/early_otherwise_branch.rs:24:14: 24:15
45+
- goto -> bb4; // scope 0 at $DIR/early_otherwise_branch.rs:24:14: 24:15
46+
+ goto -> bb3; // scope 0 at $DIR/early_otherwise_branch.rs:24:14: 24:15
47+
}
48+
49+
bb2: {
50+
- _6 = discriminant((_3.1: std::option::Option<bool>)); // scope 0 at $DIR/early_otherwise_branch.rs:22:11: 22:17
51+
- switchInt(move _6) -> [1_isize: bb3, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
52+
- }
53+
-
54+
- bb3: {
55+
StorageLive(_8); // scope 0 at $DIR/early_otherwise_branch.rs:23:15: 23:16
56+
_8 = (((_3.0: std::option::Option<u32>) as Some).0: u32); // scope 0 at $DIR/early_otherwise_branch.rs:23:15: 23:16
57+
StorageLive(_9); // scope 0 at $DIR/early_otherwise_branch.rs:23:24: 23:25
58+
_9 = (((_3.1: std::option::Option<bool>) as Some).0: bool); // scope 0 at $DIR/early_otherwise_branch.rs:23:24: 23:25
59+
_0 = const 0_u32; // scope 1 at $DIR/early_otherwise_branch.rs:23:31: 23:32
60+
StorageDead(_9); // scope 0 at $DIR/early_otherwise_branch.rs:23:31: 23:32
61+
StorageDead(_8); // scope 0 at $DIR/early_otherwise_branch.rs:23:31: 23:32
62+
- goto -> bb4; // scope 0 at $DIR/early_otherwise_branch.rs:23:31: 23:32
63+
+ goto -> bb3; // scope 0 at $DIR/early_otherwise_branch.rs:23:31: 23:32
64+
}
65+
66+
- bb4: {
67+
+ bb3: {
68+
StorageDead(_3); // scope 0 at $DIR/early_otherwise_branch.rs:26:1: 26:2
69+
return; // scope 0 at $DIR/early_otherwise_branch.rs:26:2: 26:2
70+
+ }
71+
+
72+
+ bb4: {
73+
+ StorageDead(_11); // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
74+
+ switchInt(_7) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch.rs:22:5: 22:17
75+
}
76+
}
77+

‎src/test/mir-opt/early_otherwise_branch.rs‎

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -16,7 +16,17 @@ fn opt2(x: Option<u32>, y: Option<u32>) -> u32 {
1616
}
1717
}
1818

19+
// optimize despite different types
20+
// EMIT_MIR early_otherwise_branch.opt3.EarlyOtherwiseBranch.diff
21+
fn opt3(x: Option<u32>, y: Option<bool>) -> u32 {
22+
match (x, y) {
23+
(Some(a), Some(b)) => 0,
24+
_ => 1,
25+
}
26+
}
27+
1928
fn main() {
2029
opt1(None, Some(0));
2130
opt2(None, Some(0));
31+
opt3(None, Some(false));
2232
}

‎src/test/mir-opt/early_otherwise_branch_3_element_tuple.opt1.EarlyOtherwiseBranch.diff‎

Lines changed: 7 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -16,10 +16,10 @@
1616
let _11: u32; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:15: 6:16
1717
let _12: u32; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:24: 6:25
1818
let _13: u32; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:33: 6:34
19-
+ let mut _14: isize; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:19: 6:26
20-
+ let mut _15: bool; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:19: 6:26
21-
+ let mut _16: isize; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:28: 6:35
22-
+ let mut _17: bool; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:28: 6:35
19+
+ let mut _14: isize; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
20+
+ let mut _15: bool; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
21+
+ let mut _16: isize; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
22+
+ let mut _17: bool; // in scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
2323
scope 1 {
2424
debug a => _11; // in scope 1 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:15: 6:16
2525
debug b => _12; // in scope 1 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:24: 6:25
@@ -45,7 +45,7 @@
4545
+ StorageLive(_14); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
4646
+ _14 = discriminant((_4.1: std::option::Option<u32>)); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
4747
+ StorageLive(_15); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
48-
+ _15 = Ne(_14, _10); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
48+
+ _15 = Ne(_10, move _14); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
4949
+ StorageDead(_14); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
5050
+ switchInt(move _15) -> [false: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
5151
}
@@ -92,8 +92,8 @@
9292
+ }
9393
+
9494
+ bb5: {
95-
+ StorageDead(_15); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:19: 6:26
96-
+ switchInt(_10) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:6:19: 6:26
95+
+ StorageDead(_15); // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
96+
+ switchInt(_10) -> [1_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_3_element_tuple.rs:5:5: 5:20
9797
}
9898
}
9999

‎src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.before-SimplifyConstCondition-final.after.diff‎

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -36,8 +36,8 @@
3636
let mut _31: f32; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:25:50: 25:55
3737
let mut _32: !; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:26:14: 26:28
3838
let mut _33: (); // in scope 0 at $DIR/early_otherwise_branch_68867.rs:26:25: 26:27
39-
+ let mut _34: isize; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
40-
+ let mut _35: bool; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
39+
+ let mut _34: isize; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
40+
+ let mut _35: bool; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
4141
scope 1 {
4242
- debug one => _12; // in scope 1 at $DIR/early_otherwise_branch_68867.rs:22:14: 22:17
4343
- debug other => _13; // in scope 1 at $DIR/early_otherwise_branch_68867.rs:22:24: 22:29
@@ -85,7 +85,7 @@
8585
+ StorageLive(_34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
8686
+ _34 = discriminant((*(_4.1: &ViewportPercentageLength))); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
8787
+ StorageLive(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
88-
+ _35 = Ne(_34, _11); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
88+
+ _35 = Ne(_11, move _34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
8989
+ StorageDead(_34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
9090
+ switchInt(move _35) -> [false: bb7, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
9191
}
@@ -293,8 +293,8 @@
293293
- StorageDead(_3); // scope 0 at $DIR/early_otherwise_branch_68867.rs:27:6: 27:7
294294
- StorageDead(_4); // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:1: 28:2
295295
- return; // scope 0 at $DIR/early_otherwise_branch_68867.rs:28:2: 28:2
296-
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
297-
+ switchInt(_11) -> [0_isize: bb2, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
296+
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
297+
+ switchInt(_11) -> [0_isize: bb2, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
298298
}
299299
}
300300

‎src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.diff‎

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -36,8 +36,8 @@
3636
let mut _31: f32; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:25:50: 25:55
3737
let mut _32: !; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:26:14: 26:28
3838
let mut _33: (); // in scope 0 at $DIR/early_otherwise_branch_68867.rs:26:25: 26:27
39-
+ let mut _34: isize; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
40-
+ let mut _35: bool; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
39+
+ let mut _34: isize; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
40+
+ let mut _35: bool; // in scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
4141
scope 1 {
4242
debug one => _12; // in scope 1 at $DIR/early_otherwise_branch_68867.rs:22:14: 22:17
4343
debug other => _13; // in scope 1 at $DIR/early_otherwise_branch_68867.rs:22:24: 22:29
@@ -71,7 +71,7 @@
7171
+ StorageLive(_34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7272
+ _34 = discriminant((*(_4.1: &ViewportPercentageLength))); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7373
+ StorageLive(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
74-
+ _35 = Ne(_34, _11); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
74+
+ _35 = Ne(_11, move _34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7575
+ StorageDead(_34); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7676
+ switchInt(move _35) -> [false: bb7, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
7777
}
@@ -209,8 +209,8 @@
209209
+ }
210210
+
211211
+ bb7: {
212-
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
213-
+ switchInt(_11) -> [0_isize: bb2, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:22:21: 22:30
212+
+ StorageDead(_35); // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
213+
+ switchInt(_11) -> [0_isize: bb2, 1_isize: bb3, 2_isize: bb4, 3_isize: bb5, otherwise: bb1]; // scope 0 at $DIR/early_otherwise_branch_68867.rs:21:8: 21:24
214214
}
215215
}
216216

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