Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

Odin: dev-2025-07:2fc8ca6cf
OS: Fedora Linux 41 (Workstation Edition), Linux 6.15.4-100.fc41.x86_64
CPU: AMD Ryzen 5 7600 6-Core Processor
RAM: 63444 MiB
Backend: LLVM 19.1.7

Expected Behavior

No compiler crash

Current Behavior

Compiler crash

Failure Information (for bugs)

Checked with a debugger and it happens in some "tuple fix" code at llvm_backend_proc.cpp:1208. If I make the first arg to failing_proc a pointer instead it doesn't crash.

Steps to Reproduce

Please provide detailed steps for reproducing the issue.

1.  package main
   
    import "core:fmt"
    
    My_Struct :: struct {}
    Other_Struct :: struct {
    	some: int,
    	data: string,
    }
    
    failing_proc :: proc(arg: My_Struct) -> (Other_Struct, bool) {
    	return {}, false
    }
    
    main :: proc() {
    	for _ in failing_proc(My_Struct{}) {
    		fmt.printf("blah")
    	}
    }

2. odin build -target=js_wasm32
3. Compiler crash

Failure Logs

src/array.cpp(13): Assertion Failure: `cast(usize)index < cast(usize)count` Index 1 is out of bounds ranges 0..<1