[naga] Don't report shader errors as their own source (#8258)

CHANGELOG.md

@@ -197,6 +197,7 @@ By @cwfitzgerald in [#8162](https://github.com/gfx-rs/wgpu/pull/8162).
 - Add f16 IO polyfill on Vulkan backend to enable SHADER_F16 use without requiring `storageInputOutput16`. By @cryvosh in [#7884](https://github.com/gfx-rs/wgpu/pull/7884).
 - For custom Naga backend authors: `naga::proc::Namer` now accepts reserved keywords using two new dedicated types, `proc::{KeywordSet, CaseInsensitiveKeywordSet}`. By @kpreid in [#8136](https://github.com/gfx-rs/wgpu/pull/8136).
 - **BREAKING**: Previously the WGSL storage-texture format `rg11b10float` was incorrectly accepted and generated by naga, but now only accepts the the correct name `rg11b10ufloat` instead. By @ErikWDev in [#8219](https://github.com/gfx-rs/wgpu/pull/8219).
+- The [`source()`](https://doc.rust-lang.org/std/error/trait.Error.html#method.source) method of `ShaderError` no longer reports the error as its own source. By @andyleiserson in [#8258](https://github.com/gfx-rs/wgpu/pull/8258).
 
 #### DX12
 

naga/src/error.rs

@@ -134,7 +134,7 @@ where
     E: Error + 'static,
 {
     fn source(&self) -> Option<&(dyn Error + 'static)> {
-        Some(&self.inner)
+        self.inner.source()
     }
 }
 

naga/src/front/glsl/error.rs

@@ -198,11 +198,7 @@ impl core::fmt::Display for ParseErrors {
     }
 }
 
-impl core::error::Error for ParseErrors {
-    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
-        None
-    }
-}
+impl core::error::Error for ParseErrors {}
 
 impl From<Vec<Error>> for ParseErrors {
     fn from(errors: Vec<Error>) -> Self {

naga/src/front/wgsl/error.rs

@@ -127,11 +127,7 @@ impl core::fmt::Display for ParseError {
     }
 }
 
-impl core::error::Error for ParseError {
-    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
-        None
-    }
-}
+impl core::error::Error for ParseError {}
 
 #[derive(Copy, Clone, Debug, PartialEq)]
 pub enum ExpectedToken<'a> {