[hlsl-out] let a = array<f32>(); causes a crash #8442
Description
If one uses the following WGSL shader:
@compute @workgroup_size(1)
fn main() {
let a = array<f32>(); // pretty sure this is invalid
}…to emit HLSL via naga-cli, then the process crashes like this:
RUST_BACKTRACE=1 cargo run -p naga-cli --quiet -- ../in.wgsl ../out.hlsl
thread 'main' panicked at naga\src\back\hlsl\conv.rs:115:18:
internal error: entered unreachable code
stack backtrace:
0: std::panicking::begin_panic_handler
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library\std\src\panicking.rs:697
1: core::panicking::panic_fmt
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library\core\src\panicking.rs:75
2: core::panicking::panic
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library\core\src\panicking.rs:145
3: enum2$<naga::ir::TypeInner>::hlsl_type_id
at .\naga\src\back\hlsl\conv.rs:115
4: naga::back::hlsl::Writer<ref_mut$<alloc::string::String> >::write_wrapped_zero_value_function_name<ref_mut$<alloc::string::String> >
at .\naga\src\back\hlsl\help.rs:2251
5: naga::back::hlsl::Writer<ref_mut$<alloc::string::String> >::write_wrapped_zero_value_function<ref_mut$<alloc::string::String> >
at .\naga\src\back\hlsl\help.rs:2283
6: naga::back::hlsl::Writer<ref_mut$<alloc::string::String> >::write_wrapped_zero_value_functions<ref_mut$<alloc::string::String> >
at .\naga\src\back\hlsl\help.rs:1350
7: naga::back::hlsl::Writer<ref_mut$<alloc::string::String> >::write_wrapped_functions<ref_mut$<alloc::string::String> >
at .\naga\src\back\hlsl\help.rs:1838
8: naga::back::hlsl::Writer<ref_mut$<alloc::string::String> >::write<ref_mut$<alloc::string::String> >
at .\naga\src\back\hlsl\writer.rs:508
9: naga::write_output
at .\naga-cli\src\bin\naga.rs:918
10: naga::run
at .\naga-cli\src\bin\naga.rs:648
11: naga::main
at .\naga-cli\src\bin\naga.rs:402
12: core::ops::function::FnOnce::call_once<void (*)(),tuple$<> >
at C:\Users\<snip>\.rustup\toolchains\1.88-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:250
13: core::hint::black_box
at C:\Users\<snip>\.rustup\toolchains\1.88-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\hint.rs:482
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
Originally reported by @stefnotch in bug 1997070 in Mozilla's bug tracker.