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e023f75254bd282c643e9a55afaa0d4994eee6e7
carbon-lang/toolchain/lower/testdata/function/generic/call_recursive_basic.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/generic/call_recursive_basic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_recursive_basic.carbon
class C {
impl as Core.Copy {
fn Op(unused self) -> Self { return {}; }
}
}
// The two specifics for recursive function F, when T is a pointer, could be
// deduplicated.
fn F[T:! Core.Copy](x: T, count: i32) -> T {
if (count > 0) {
return x;
}
return F(x, count + 1);
}
fn M() {
var n: i32 = 0;
var m: f64 = 1.0;
var ptr_i32 : i32* = &n;
var ptr_f64 : f64* = &m;
F(n, 0);
F(m, 0);
F(ptr_i32, 0);
F(ptr_f64, 0);
var c: C = {};
F(c, 0);
}
// CHECK:STDOUT: ; ModuleID = 'call_recursive_basic.carbon'
// CHECK:STDOUT: source_filename = "call_recursive_basic.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @C.val.loc15_43 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_COp.C.Main:Copy.Core"(ptr sret({}) %return, ptr %self) #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %return, ptr align 1 @C.val.loc15_43, i64 0, i1 false), !dbg !10
// CHECK:STDOUT: ret void, !dbg !10
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CM.Main() #0 !dbg !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !14
// CHECK:STDOUT: %m.var = alloca double, align 8, !dbg !15
// CHECK:STDOUT: %ptr_i32.var = alloca ptr, align 8, !dbg !16
// CHECK:STDOUT: %ptr_f64.var = alloca ptr, align 8, !dbg !17
// CHECK:STDOUT: %c.var = alloca {}, align 1, !dbg !18
// CHECK:STDOUT: %.loc40_9.3.temp = alloca {}, align 1, !dbg !19
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !14
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !14
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %m.var), !dbg !15
// CHECK:STDOUT: store double 1.000000e+00, ptr %m.var, align 8, !dbg !15
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i32.var), !dbg !16
// CHECK:STDOUT: store ptr %n.var, ptr %ptr_i32.var, align 8, !dbg !16
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_f64.var), !dbg !17
// CHECK:STDOUT: store ptr %m.var, ptr %ptr_f64.var, align 8, !dbg !17
// CHECK:STDOUT: %.loc34_5 = load i32, ptr %n.var, align 4, !dbg !20
// CHECK:STDOUT: %F.call.loc34 = call i32 @_CF.Main.5bd8d5767580997a(i32 %.loc34_5, i32 0), !dbg !21
// CHECK:STDOUT: %.loc35_5 = load double, ptr %m.var, align 8, !dbg !22
// CHECK:STDOUT: %F.call.loc35 = call double @_CF.Main.c27b765f2159c9a0(double %.loc35_5, i32 0), !dbg !23
// CHECK:STDOUT: %.loc36_5 = load ptr, ptr %ptr_i32.var, align 8, !dbg !24
// CHECK:STDOUT: %F.call.loc36 = call ptr @_CF.Main.2621742a01881e29(ptr %.loc36_5, i32 0), !dbg !25
// CHECK:STDOUT: %.loc37_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !26
// CHECK:STDOUT: %F.call.loc37 = call ptr @_CF.Main.2621742a01881e29(ptr %.loc37_5, i32 0), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !18
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %c.var, ptr align 1 @C.val.loc15_43, i64 0, i1 false), !dbg !18
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc40_9.3.temp), !dbg !19
// CHECK:STDOUT: call void @_CF.Main.4d597ec621e4ba00(ptr %.loc40_9.3.temp, ptr %c.var, i32 0), !dbg !19
// CHECK:STDOUT: call void @"_COp.807eb4f2d3ed7e54:core.Destroy.Core"(ptr %.loc40_9.3.temp), !dbg !19
// CHECK:STDOUT: call void @"_COp.807eb4f2d3ed7e54:core.Destroy.Core"(ptr %c.var), !dbg !18
// CHECK:STDOUT: call void @"_COp.30d8007fdcc57f83:core.Destroy.Core"(ptr %m.var), !dbg !15
// CHECK:STDOUT: call void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %n.var), !dbg !14
// CHECK:STDOUT: ret void, !dbg !28
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.807eb4f2d3ed7e54:core.Destroy.Core"(ptr %self) #0 !dbg !29 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !34
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.30d8007fdcc57f83:core.Destroy.Core"(ptr %self) #0 !dbg !35 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !38
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %self) #0 !dbg !39 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !45
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CF.Main.5bd8d5767580997a(i32 %x, i32 %count) #0 !dbg !46 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !52
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !53
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret i32 %x, !dbg !54
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !55
// CHECK:STDOUT: %F.call = call i32 @_CF.Main.5bd8d5767580997a(i32 %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !56
// CHECK:STDOUT: ret i32 %F.call, !dbg !57
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr double @_CF.Main.c27b765f2159c9a0(double %x, i32 %count) #0 !dbg !58 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !64
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !65
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret double %x, !dbg !66
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !67
// CHECK:STDOUT: %F.call = call double @_CF.Main.c27b765f2159c9a0(double %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !68
// CHECK:STDOUT: ret double %F.call, !dbg !69
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @_CF.Main.2621742a01881e29(ptr %x, i32 %count) #0 !dbg !70 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !74
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !75
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret ptr %x, !dbg !76
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !77
// CHECK:STDOUT: %F.call = call ptr @_CF.Main.2621742a01881e29(ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !78
// CHECK:STDOUT: ret ptr %F.call, !dbg !79
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CF.Main.4d597ec621e4ba00(ptr sret({}) %return, ptr %x, i32 %count) #0 !dbg !80 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !84
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !85
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: call void @"_COp.C.Main:Copy.Core"(ptr %return, ptr %x), !dbg !86
// CHECK:STDOUT: ret void, !dbg !87
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !88
// CHECK:STDOUT: call void @_CF.Main.4d597ec621e4ba00(ptr %return, ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !89
// CHECK:STDOUT: ret void, !dbg !90
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_COp.807eb4f2d3ed7e54:core.Destroy.Core", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.memcpy.p0.p0.i64, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 5, 4, 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CF.Main.2621742a01881e29, { 1, 2, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "call_recursive_basic.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Op", linkageName: "_COp.C.Main:Copy.Core", scope: null, file: !3, line: 15, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{!7, !7}
// CHECK:STDOUT: !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !8 = !{!9}
// CHECK:STDOUT: !9 = !DILocalVariable(arg: 1, scope: !4, type: !7)
// CHECK:STDOUT: !10 = !DILocation(line: 15, column: 34, scope: !4)
// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 28, type: !12, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !12 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !13 = !{null}
// CHECK:STDOUT: !14 = !DILocation(line: 29, column: 3, scope: !11)
// CHECK:STDOUT: !15 = !DILocation(line: 30, column: 3, scope: !11)
// CHECK:STDOUT: !16 = !DILocation(line: 31, column: 3, scope: !11)
// CHECK:STDOUT: !17 = !DILocation(line: 32, column: 3, scope: !11)
// CHECK:STDOUT: !18 = !DILocation(line: 39, column: 3, scope: !11)
// CHECK:STDOUT: !19 = !DILocation(line: 40, column: 3, scope: !11)
// CHECK:STDOUT: !20 = !DILocation(line: 34, column: 5, scope: !11)
// CHECK:STDOUT: !21 = !DILocation(line: 34, column: 3, scope: !11)
// CHECK:STDOUT: !22 = !DILocation(line: 35, column: 5, scope: !11)
// CHECK:STDOUT: !23 = !DILocation(line: 35, column: 3, scope: !11)
// CHECK:STDOUT: !24 = !DILocation(line: 36, column: 5, scope: !11)
// CHECK:STDOUT: !25 = !DILocation(line: 36, column: 3, scope: !11)
// CHECK:STDOUT: !26 = !DILocation(line: 37, column: 5, scope: !11)
// CHECK:STDOUT: !27 = !DILocation(line: 37, column: 3, scope: !11)
// CHECK:STDOUT: !28 = !DILocation(line: 28, column: 1, scope: !11)
// CHECK:STDOUT: !29 = distinct !DISubprogram(name: "Op", linkageName: "_COp.807eb4f2d3ed7e54:core.Destroy.Core", scope: null, file: !3, line: 40, type: !30, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !32)
// CHECK:STDOUT: !30 = !DISubroutineType(types: !31)
// CHECK:STDOUT: !31 = !{null, !7}
// CHECK:STDOUT: !32 = !{!33}
// CHECK:STDOUT: !33 = !DILocalVariable(arg: 1, scope: !29, type: !7)
// CHECK:STDOUT: !34 = !DILocation(line: 40, column: 3, scope: !29)
// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "Op", linkageName: "_COp.30d8007fdcc57f83:core.Destroy.Core", scope: null, file: !3, line: 30, type: !30, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !36)
// CHECK:STDOUT: !36 = !{!37}
// CHECK:STDOUT: !37 = !DILocalVariable(arg: 1, scope: !35, type: !7)
// CHECK:STDOUT: !38 = !DILocation(line: 30, column: 3, scope: !35)
// CHECK:STDOUT: !39 = distinct !DISubprogram(name: "Op", linkageName: "_COp.5e27612b9dd31a14:core.Destroy.Core", scope: null, file: !3, line: 29, type: !40, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !43)
// CHECK:STDOUT: !40 = !DISubroutineType(types: !41)
// CHECK:STDOUT: !41 = !{null, !42}
// CHECK:STDOUT: !42 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !43 = !{!44}
// CHECK:STDOUT: !44 = !DILocalVariable(arg: 1, scope: !39, type: !42)
// CHECK:STDOUT: !45 = !DILocation(line: 29, column: 3, scope: !39)
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.5bd8d5767580997a", scope: null, file: !3, line: 21, type: !47, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !49)
// CHECK:STDOUT: !47 = !DISubroutineType(types: !48)
// CHECK:STDOUT: !48 = !{!42, !42, !42}
// CHECK:STDOUT: !49 = !{!50, !51}
// CHECK:STDOUT: !50 = !DILocalVariable(arg: 1, scope: !46, type: !42)
// CHECK:STDOUT: !51 = !DILocalVariable(arg: 2, scope: !46, type: !42)
// CHECK:STDOUT: !52 = !DILocation(line: 22, column: 7, scope: !46)
// CHECK:STDOUT: !53 = !DILocation(line: 22, column: 6, scope: !46)
// CHECK:STDOUT: !54 = !DILocation(line: 23, column: 5, scope: !46)
// CHECK:STDOUT: !55 = !DILocation(line: 25, column: 15, scope: !46)
// CHECK:STDOUT: !56 = !DILocation(line: 25, column: 10, scope: !46)
// CHECK:STDOUT: !57 = !DILocation(line: 25, column: 3, scope: !46)
// CHECK:STDOUT: !58 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.c27b765f2159c9a0", scope: null, file: !3, line: 21, type: !59, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !61)
// CHECK:STDOUT: !59 = !DISubroutineType(types: !60)
// CHECK:STDOUT: !60 = !{!7, !7, !42}
// CHECK:STDOUT: !61 = !{!62, !63}
// CHECK:STDOUT: !62 = !DILocalVariable(arg: 1, scope: !58, type: !7)
// CHECK:STDOUT: !63 = !DILocalVariable(arg: 2, scope: !58, type: !42)
// CHECK:STDOUT: !64 = !DILocation(line: 22, column: 7, scope: !58)
// CHECK:STDOUT: !65 = !DILocation(line: 22, column: 6, scope: !58)
// CHECK:STDOUT: !66 = !DILocation(line: 23, column: 5, scope: !58)
// CHECK:STDOUT: !67 = !DILocation(line: 25, column: 15, scope: !58)
// CHECK:STDOUT: !68 = !DILocation(line: 25, column: 10, scope: !58)
// CHECK:STDOUT: !69 = !DILocation(line: 25, column: 3, scope: !58)
// CHECK:STDOUT: !70 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.2621742a01881e29", scope: null, file: !3, line: 21, type: !59, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !71)
// CHECK:STDOUT: !71 = !{!72, !73}
// CHECK:STDOUT: !72 = !DILocalVariable(arg: 1, scope: !70, type: !7)
// CHECK:STDOUT: !73 = !DILocalVariable(arg: 2, scope: !70, type: !42)
// CHECK:STDOUT: !74 = !DILocation(line: 22, column: 7, scope: !70)
// CHECK:STDOUT: !75 = !DILocation(line: 22, column: 6, scope: !70)
// CHECK:STDOUT: !76 = !DILocation(line: 23, column: 5, scope: !70)
// CHECK:STDOUT: !77 = !DILocation(line: 25, column: 15, scope: !70)
// CHECK:STDOUT: !78 = !DILocation(line: 25, column: 10, scope: !70)
// CHECK:STDOUT: !79 = !DILocation(line: 25, column: 3, scope: !70)
// CHECK:STDOUT: !80 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.4d597ec621e4ba00", scope: null, file: !3, line: 21, type: !59, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !81)
// CHECK:STDOUT: !81 = !{!82, !83}
// CHECK:STDOUT: !82 = !DILocalVariable(arg: 1, scope: !80, type: !7)
// CHECK:STDOUT: !83 = !DILocalVariable(arg: 2, scope: !80, type: !42)
// CHECK:STDOUT: !84 = !DILocation(line: 22, column: 7, scope: !80)
// CHECK:STDOUT: !85 = !DILocation(line: 22, column: 6, scope: !80)
// CHECK:STDOUT: !86 = !DILocation(line: 23, column: 12, scope: !80)
// CHECK:STDOUT: !87 = !DILocation(line: 23, column: 5, scope: !80)
// CHECK:STDOUT: !88 = !DILocation(line: 25, column: 15, scope: !80)
// CHECK:STDOUT: !89 = !DILocation(line: 25, column: 10, scope: !80)
// CHECK:STDOUT: !90 = !DILocation(line: 25, column: 3, scope: !80)
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