Taking a slice of certain comptime arrays with a sentinel causes the compiler to segfault

[alexnask]

I can currently reproduce this with arrays initialized as undefined and arrays returned by @typeName and string literals but not with arrays initialized from literals.

comptime {
    const arr: [100]u16 = undefined;
    const slice = arr[0..12:0];
}

comptime {
    const str = "abcdefg";
    const slice = str[0..1:12];
}

pub fn main() void {
    comptime {
        const arr = @typeName(@TypeOf(main));
        const slice = arr[0..2:0];
    }
}

gdb backtrace

(gdb) run run /mnt/c/dev/test.zig                                                                                                                                                            
Starting program: /mnt/c/dev/zig/build-linux/zig run /mnt/c/dev/test.zig                                                                                                                     
[Thread debugging using libthread_db enabled]                                                                                                                                                
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".                                                                                                                   
                                                                                                                                                                                             
Program received signal SIGSEGV, Segmentation fault.                                                                                                                                         
0x0000000009269e57 in const_values_equal (g=0x10b01620, a=0x10b22900, b=0x420) at /mnt/c/dev/zig/src/analyze.cpp:6876                                                                        
6876        if (a->type->id != b->type->id) return false;                                                                                                                                    
(gdb) bt                                                                                                                                                                                     
#0  0x0000000009269e57 in const_values_equal (g=0x10b01620, a=0x10b22900, b=0x420) at /mnt/c/dev/zig/src/analyze.cpp:6876                                                                    
#1  0x0000000009207c7b in ir_analyze_instruction_slice (ira=0x10bfa1e0, instruction=0x10bf8f20) at /mnt/c/dev/zig/src/ir.cpp:27265                                                           
#2  0x0000000009213e0b in ir_analyze_instruction_base (ira=0x10bfa1e0, instruction=0x10bf8f20) at /mnt/c/dev/zig/src/ir.cpp:30521                                                            
#3  0x0000000009214899 in ir_analyze (codegen=0x10b01620, old_exec=0x10bf4670, new_exec=0x10bfa130, expected_type=0x10b1d070, expected_type_source_node=0x0, result_ptr=0x10b22220)          
    at /mnt/c/dev/zig/src/ir.cpp:30724                                                                                                                                                       
#4  0x00000000091d184c in ir_eval_const_value (codegen=0x10b01620, scope=0x10b51af0, node=0x10b52410, return_ptr=0x10b22220, backward_branch_count=0x7ffffffed138,                           
    backward_branch_quota=0x7ffffffed140, fn_entry=0x0, c_import_buf=0x0, source_node=0x10b52410, exec_name=0x0, parent_exec=0x0, expected_type_source_node=0x0, undef_allowed=UndefBad)     
    at /mnt/c/dev/zig/src/ir.cpp:13353                                                                                                                                                       
#5  0x0000000009257901 in analyze_const_value (g=0x10b01620, scope=0x10b51af0, node=0x10b52410, type_entry=0x10b1d070, type_name=0x0, undef=UndefBad) at /mnt/c/dev/zig/src/analyze.cpp:1141 
#6  0x000000000925f8f1 in resolve_decl_comptime (g=0x10b01620, tld_comptime=0x10b52670) at /mnt/c/dev/zig/src/analyze.cpp:3610                                                               
#7  0x000000000926176d in resolve_top_level_decl (g=0x10b01620, tld=0x10b52670, source_node=0x0, allow_lazy=false) at /mnt/c/dev/zig/src/analyze.cpp:4215                                    
#8  0x00000000092643a5 in semantic_analyze (g=0x10b01620) at /mnt/c/dev/zig/src/analyze.cpp:5069                                                                                             
#9  0x000000000918e02e in gen_root_source (g=0x10b01620) at /mnt/c/dev/zig/src/codegen.cpp:9772                                                                                              
#10 0x00000000091927e2 in codegen_build_and_link (g=0x10b01620) at /mnt/c/dev/zig/src/codegen.cpp:10886                                                                                      
#11 0x0000000009161e3a in main0 (argc=3, argv=0x7ffffffedbd8) at /mnt/c/dev/zig/src/main.cpp:1671                                                                                            
#12 0x00000000091629be in main (argc=3, argv=0x7ffffffedbd8) at /mnt/c/dev/zig/src/main.cpp:1858                                                                                             
(gdb) f 0                                                                                                                                                                                    
#0  0x0000000009269e57 in const_values_equal (g=0x10b01620, a=0x10b22900, b=0x420) at /mnt/c/dev/zig/src/analyze.cpp:6876                                                                    
6876        if (a->type->id != b->type->id) return false;                                                                                                                                    
(gdb) p b                                                                                                                                                                                    
$1 = (ZigValue *) 0x420