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Compiler crash with tuples #31666

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opened 2026年03月25日 19:13:00 +01:00 by FnControlOption · 1 comment

Zig Version

0.16.0-dev.2736+3b515fbed

Steps to Reproduce and Observed Behavior

Run this code multiple times:

pubfnmain()void{// These work:@compileLog(@TypeOf(@as([2]u64,undefined)++@as([3]u64,undefined)));@compileLog(@TypeOf(@as([2]u64,.{1,2})++@as(struct{u32,u16,u8},.{3,4,5})));// This causes a crash:@compileLog(@TypeOf(@as([2]u64,undefined)++@as(struct{u32,u16,u8},undefined)));}

It will crash with varying outputs:

[1] 62350 segmentation fault zig run "/tmp/bug.zig"

/tmp/bug.zig:7:51: error: expected type 'u64', found 'Build'
 @compileLog(@TypeOf(@as([2]u64, undefined) ++ @as(struct { u32, u16, u8 }, undefined)));
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/std.zig:3:5: note: struct declared here
pub const AutoArrayHashMap = array_hash_map.AutoArrayHashMap;
~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
referenced by:
 callMain [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:677:59
 callMainWithArgs [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:629:20
 main: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:654:28
 1 reference(s) hidden; use '-freference-trace=4' to see all references
Compile Log Output:
@as(type, [5]u64)
@as(type, [5]u64)

/tmp/bug.zig:7:51: error: expected type 'u64', found 'CompareOperator'
 @compileLog(@TypeOf(@as([2]u64, undefined) ++ @as(struct { u32, u16, u8 }, undefined)));
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/ubsan_rt.zig:339:1: note: struct declared here
fn outOfBounds(
^~
referenced by:
 callMain [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:677:59
 callMainWithArgs [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:629:20
 main: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:654:28
 1 reference(s) hidden; use '-freference-trace=4' to see all references
Compile Log Output:
@as(type, [5]u64)
@as(type, [5]u64)

Expected Behavior

Expected output:

/tmp/bug.zig:3:5: error: found compile log statement
 @compileLog(@TypeOf(@as([2]u64, undefined) ++ @as([3]u64, undefined)));
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
referenced by:
 callMain [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:677:59
 callMainWithArgs [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:629:20
 main: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:654:28
 1 reference(s) hidden; use '-freference-trace=4' to see all references
Compile Log Output:
@as(type, [5]u64)
@as(type, [5]u64)
@as(type, [5]u64)
### Zig Version 0.16.0-dev.2736+3b515fbed ### Steps to Reproduce and Observed Behavior Run this code multiple times: ```zig pub fn main() void { // These work: @compileLog(@TypeOf(@as([2]u64, undefined) ++ @as([3]u64, undefined))); @compileLog(@TypeOf(@as([2]u64, .{ 1, 2 }) ++ @as(struct { u32, u16, u8 }, .{ 3, 4, 5 }))); // This causes a crash: @compileLog(@TypeOf(@as([2]u64, undefined) ++ @as(struct { u32, u16, u8 }, undefined))); } ``` It will crash with varying outputs: ``` [1] 62350 segmentation fault zig run "/tmp/bug.zig" ``` ``` /tmp/bug.zig:7:51: error: expected type 'u64', found 'Build' @compileLog(@TypeOf(@as([2]u64, undefined) ++ @as(struct { u32, u16, u8 }, undefined))); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/std.zig:3:5: note: struct declared here pub const AutoArrayHashMap = array_hash_map.AutoArrayHashMap; ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ referenced by: callMain [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:677:59 callMainWithArgs [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:629:20 main: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:654:28 1 reference(s) hidden; use '-freference-trace=4' to see all references Compile Log Output: @as(type, [5]u64) @as(type, [5]u64) ``` ``` /tmp/bug.zig:7:51: error: expected type 'u64', found 'CompareOperator' @compileLog(@TypeOf(@as([2]u64, undefined) ++ @as(struct { u32, u16, u8 }, undefined))); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/ubsan_rt.zig:339:1: note: struct declared here fn outOfBounds( ^~ referenced by: callMain [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:677:59 callMainWithArgs [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:629:20 main: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:654:28 1 reference(s) hidden; use '-freference-trace=4' to see all references Compile Log Output: @as(type, [5]u64) @as(type, [5]u64) ``` ### Expected Behavior Expected output: ``` /tmp/bug.zig:3:5: error: found compile log statement @compileLog(@TypeOf(@as([2]u64, undefined) ++ @as([3]u64, undefined))); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ referenced by: callMain [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:677:59 callMainWithArgs [inlined]: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:629:20 main: /Users/fco/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/aarch64-macos-0.16.0-dev.2736+3b515fbed/lib/std/start.zig:654:28 1 reference(s) hidden; use '-freference-trace=4' to see all references Compile Log Output: @as(type, [5]u64) @as(type, [5]u64) @as(type, [5]u64) ``` 
thread 133893 panic: reached unreachable code
/home/alexrp/Sources/ziglang/zig/src/Value.zig:828:13: 0x19162d5 in elemValue (zig)
 switch (zcu.intern_pool.indexToKey(val.toIntern())) {
 ^
/home/alexrp/Sources/ziglang/zig/src/Sema.zig:13751:83: 0x1daaa75 in zirArrayCat (zig)
 const elem_val = elem_default_val orelse try rhs_sub_val.elemValue(pt, rhs_elem_i);
 ^
/home/alexrp/Sources/ziglang/zig/src/Sema.zig:1176:66: 0x1d58f7a in analyzeBodyInner (zig)
 .array_cat => try sema.zirArrayCat(block, inst),
 ^
/home/alexrp/Sources/ziglang/zig/src/Sema.zig:1072:30: 0x1df62b5 in analyzeInlineBody (zig)
 if (sema.analyzeBodyInner(block, body)) {
 ^
/home/alexrp/Sources/ziglang/zig/src/Sema.zig:1105:39: 0x1d5bb2e in resolveInlineBody (zig)
 return (try sema.analyzeInlineBody(block, body, break_target)) orelse .unreachable_value;
 ^
/home/alexrp/Sources/ziglang/zig/src/Sema.zig:1054:26: 0x1ece727 in analyzeFnBody (zig)
 sema.analyzeBodyInner(block, body) catch |err| switch (err) {
 ^
/home/alexrp/Sources/ziglang/zig/src/Zcu/PerThread.zig:2294:42: 0x1cff03d in analyzeFuncBody (zig)
 var air = try pt.analyzeFuncBodyInner(func_index, reason);
 ^
/home/alexrp/Sources/ziglang/zig/src/Zcu/PerThread.zig:345:54: 0x1c1c0b0 in update (zig)
 .func => |func| pt.ensureFuncBodyUpToDate(func, null),
 ^
/home/alexrp/Sources/ziglang/zig/src/Compilation.zig:4520:22: 0x158ab94 in performAllTheWork (zig)
 try pt.update(main_progress_node, &decl_work_timer);
 ^
/home/alexrp/Sources/ziglang/zig/src/main.zig:4671:20: 0x159992e in updateModule (zig)
 try comp.update(prog_node);
 ^
/home/alexrp/Sources/ziglang/zig/src/main.zig:3767:21: 0x15f3034 in buildOutputType (zig)
 updateModule(comp, color, root_prog_node) catch |err| switch (err) {
 ^
/home/alexrp/Sources/ziglang/zig/src/main.zig:297:31: 0x150e0aa in mainArgs (zig)
 return buildOutputType(gpa, arena, io, args, .run, environ_map);
 ^
../sysdeps/nptl/libc_start_call_main.h:58:16: 0x788ad982a574 in __libc_start_call_main (../sysdeps/x86/libc-start.c)
../csu/libc-start.c:360:3: 0x788ad982a627 in __libc_start_main_impl (../sysdeps/x86/libc-start.c)
???:?:?: 0x150d424 in ??? (???)
``` thread 133893 panic: reached unreachable code /home/alexrp/Sources/ziglang/zig/src/Value.zig:828:13: 0x19162d5 in elemValue (zig) switch (zcu.intern_pool.indexToKey(val.toIntern())) { ^ /home/alexrp/Sources/ziglang/zig/src/Sema.zig:13751:83: 0x1daaa75 in zirArrayCat (zig) const elem_val = elem_default_val orelse try rhs_sub_val.elemValue(pt, rhs_elem_i); ^ /home/alexrp/Sources/ziglang/zig/src/Sema.zig:1176:66: 0x1d58f7a in analyzeBodyInner (zig) .array_cat => try sema.zirArrayCat(block, inst), ^ /home/alexrp/Sources/ziglang/zig/src/Sema.zig:1072:30: 0x1df62b5 in analyzeInlineBody (zig) if (sema.analyzeBodyInner(block, body)) { ^ /home/alexrp/Sources/ziglang/zig/src/Sema.zig:1105:39: 0x1d5bb2e in resolveInlineBody (zig) return (try sema.analyzeInlineBody(block, body, break_target)) orelse .unreachable_value; ^ /home/alexrp/Sources/ziglang/zig/src/Sema.zig:1054:26: 0x1ece727 in analyzeFnBody (zig) sema.analyzeBodyInner(block, body) catch |err| switch (err) { ^ /home/alexrp/Sources/ziglang/zig/src/Zcu/PerThread.zig:2294:42: 0x1cff03d in analyzeFuncBody (zig) var air = try pt.analyzeFuncBodyInner(func_index, reason); ^ /home/alexrp/Sources/ziglang/zig/src/Zcu/PerThread.zig:345:54: 0x1c1c0b0 in update (zig) .func => |func| pt.ensureFuncBodyUpToDate(func, null), ^ /home/alexrp/Sources/ziglang/zig/src/Compilation.zig:4520:22: 0x158ab94 in performAllTheWork (zig) try pt.update(main_progress_node, &decl_work_timer); ^ /home/alexrp/Sources/ziglang/zig/src/main.zig:4671:20: 0x159992e in updateModule (zig) try comp.update(prog_node); ^ /home/alexrp/Sources/ziglang/zig/src/main.zig:3767:21: 0x15f3034 in buildOutputType (zig) updateModule(comp, color, root_prog_node) catch |err| switch (err) { ^ /home/alexrp/Sources/ziglang/zig/src/main.zig:297:31: 0x150e0aa in mainArgs (zig) return buildOutputType(gpa, arena, io, args, .run, environ_map); ^ ../sysdeps/nptl/libc_start_call_main.h:58:16: 0x788ad982a574 in __libc_start_call_main (../sysdeps/x86/libc-start.c) ../csu/libc-start.c:360:3: 0x788ad982a627 in __libc_start_main_impl (../sysdeps/x86/libc-start.c) ???:?:?: 0x150d424 in ??? (???) ```
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