Errors with Filenames including file extension

[kphillisjr]

A little bit of clarification is needed in how file resolution works. I have a public Git repository ( see: https://github.com/kphillisjr/Shader_Slang_tests ) ) that has compile errors when i write the following code examples:

Shaders\ExampleShaderModule.slang(38): error 30502: the included source file is expected to implement module 'ExampleShaderModule', but it is implementing 'ExampleShaderModule.slang' instead.
__include "TestEmbeddedDirectory/EmbeddedSubDirectory/InterfaceFoo2.slang";
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Shaders\ExampleShaderModule.slang(41): error 30502: the included source file is expected to implement module 'ExampleShaderModule', but it is implementing 'ExampleShaderModule.slang' instead.
__include "TestEmbeddedDirectory/EmbeddedSubDirectory/MyFooType2.slang";
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Shaders/ExampleShader.slang(1): error 39999: import of module 'ExampleShaderModule' failed because of a compilation error
import ExampleShaderModule;
       ^~~~~~~~~~~~~~~~~~~
(0): fatal error 39999: compilation ceased

D:\Shader_Slang_Test\Source>

Tested Versions of Shader-SlangC:

# This is from Shader-Slang github release.
D:\Shader_Slang_Test\Source>D:\Slang\bin\slangc.exe -v
2024.17

# This is the default included in Vulkan SDK.
D:\Shader_Slang_Test\Source>slangc -v
2024.13

File: dir/subdirectory/a.slang

// dir/subdirectory/a.slang
implementing m;
void f_a() {}

File: dir/subdirectory/b.slang

// dir/subdirectory/b.slang
implementing "m"; // alternate syntax.
__include a; // pulls in `a` to module `m`.
void f_b() { f_a(); }

File: dir/subdirectory/c.slang

// dir/subdirectory/c.slang
implementing "m.slang"; // alternate syntax.

void f_c()
{
    // OK, `dir/subdirectory/c.slang` is part of module `m` because it is `__include`'d by
    // `m.slang`.
    f_a(); f_b();
}

File: m.slang

// m.slang
module m;
__include m; // OK, a file including itself is allowed and has no effect.
__include "dir/subdirectory/b"; // Pulls in file b (alternate syntax), and transitively pulls in file a.
__include "dir/subdirectory/c.slang"; // Pulls in file c, specifying the full file name.
void test() { f_a(); f_b(); f_c(); }

Edit: I made a few changes to the bug report to better describe the bug I am talking about.

• Fixed the github repository with example module code to be visible. This should show the layout of the files causing a bug.
• Added some inline shader code showing what the example module I wrote is looking at.
• This is mostly based on how the Module reference is written, so I believe my example should be considered valid code.

[kphillisjr]

Small update, I Created another repository changing the behavior, but still shows this bug:
https://github.com/kphillisjr/ShaderSlangModuleExample

D:\testshaders\ShaderSlang_Module\ShaderSlangModule\ShaderSource>slangc ExampleShader.slang -target cpp -o ExampleShader.cpp -DREVERSE_MODULE_ORDER
ExampleModule.slang(23): error 30502: the included source file is expected to implement module 'ExampleModule.slang', but it is implementing 'ExampleModule' instead.
__include "ModuleSource/Default/b";       // Pulls in file b (alternate syntax), and transitively pulls in file a.
          ^~~~~~~~~~~~~~~~~~~~~~~~
ExampleModule.slang(24): error 30502: the included source file is expected to implement module 'ExampleModule.slang', but it is implementing 'ExampleModule' instead.
__include "ModuleSource/Default/c.slang"; // Pulls in file b (alternate syntax), and transitively pulls in file a.
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ModuleSource/Default/b.slang(7): error 30502: the included source file is expected to implement module 'ExampleModule.slang', but it is implementing 'ExampleModule' instead.
__include a; // pulls in `a` to module `m`.
          ^
ExampleShader.slang(4): error 39999: import of module 'ExampleModule' failed because of a compilation error
import ExampleModule;
       ^~~~~~~~~~~~~
(0): fatal error 39999: compilation ceased

D:\testshaders\ShaderSlang_Module\ShaderSlangModule\ShaderSource>slangc ExampleShader.slang -target cpp -o ExampleShader.cpp
ExampleModule.slang(28): error 30502: the included source file is expected to implement module 'ExampleModule', but it is implementing 'ExampleModule.slang' instead.
__include "ModuleSource/UseFileExtension/b"; // Pulls in file c, specifying the full file name.
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ExampleModule.slang(29): error 30502: the included source file is expected to implement module 'ExampleModule', but it is implementing 'ExampleModule.slang' instead.
__include "ModuleSource/UseFileExtension/c.slang"; // Pulls in file c, specifying the full file name.
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ModuleSource/UseFileExtension/b.slang(9): error 30502: the included source file is expected to implement module 'ExampleModule', but it is implementing 'ExampleModule.slang' instead.
__include "a.slang";
          ^~~~~~~~~
ExampleShader.slang(4): error 39999: import of module 'ExampleModule' failed because of a compilation error
import ExampleModule;
       ^~~~~~~~~~~~~
(0): fatal error 39999: compilation ceased

D:\testshaders\ShaderSlang_Module\ShaderSlangModule\ShaderSource>