Vendor dependencies for 0.3.0 release

vendor/wgpu-core/src/error.rs

@@ -0,0 +1,64 @@
+use core::fmt;
+use std::{error::Error, sync::Arc};
+
+use thiserror::Error;
+
+#[cfg(send_sync)]
+pub type ContextErrorSource = Box<dyn Error + Send + Sync + 'static>;
+#[cfg(not(send_sync))]
+pub type ContextErrorSource = Box<dyn Error + 'static>;
+
+#[derive(Debug, Error)]
+#[error(
+    "In {fn_ident}{}{}{}",
+    if self.label.is_empty() { "" } else { ", label = '" },
+    self.label,
+    if self.label.is_empty() { "" } else { "'" }
+)]
+pub struct ContextError {
+    pub fn_ident: &'static str,
+    #[source]
+    pub source: ContextErrorSource,
+    pub label: String,
+}
+
+/// Don't use this error type with thiserror's #[error(transparent)]
+#[derive(Clone)]
+pub struct MultiError {
+    inner: Vec<Arc<dyn Error + Send + Sync + 'static>>,
+}
+
+impl MultiError {
+    pub fn new<T: Error + Send + Sync + 'static>(
+        iter: impl ExactSizeIterator<Item = T>,
+    ) -> Option<Self> {
+        if iter.len() == 0 {
+            return None;
+        }
+        Some(Self {
+            inner: iter.map(Box::from).map(Arc::from).collect(),
+        })
+    }
+
+    pub fn errors(&self) -> Box<dyn Iterator<Item = &(dyn Error + Send + Sync + 'static)> + '_> {
+        Box::new(self.inner.iter().map(|e| e.as_ref()))
+    }
+}
+
+impl fmt::Debug for MultiError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
+        fmt::Debug::fmt(&self.inner[0], f)
+    }
+}
+
+impl fmt::Display for MultiError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
+        fmt::Display::fmt(&self.inner[0], f)
+    }
+}
+
+impl Error for MultiError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        self.inner[0].source()
+    }
+}