rust: Temporarily use a patched version of failure crate

This fixes an issue in the failure crate which used a private name from the quote crate which was removed in version 1.0.3+. For more details, see: - https://users.rust-lang.org/t/failure-derive-compilation-error/39062 - rust-lang-deprecated/failure#343
oasisprotocol · Mar 5, 2020 · a5f7f1a · a5f7f1a
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diff --git a/.changelog/2754.internal.md b/.changelog/2754.internal.md
@@ -0,0 +1,5 @@
+rust: Temporarily use a patched version of failure crate
+
+This fixes an [issue in the failure crate](
+https://users.rust-lang.org/t/failure-derive-compilation-error/39062) which
+used a private name from the quote crate which was removed in version 1.0.3+.
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -21,6 +21,9 @@ members = [
 [patch.crates-io]
 # TODO: Remove when merged upstream (briansmith/ring#738).
 ring = { git = "https://github.com/oasislabs/ring-sgx", branch = "sgx-target" }
+# TODO: Remove after a new release with the fix in
+# https://github.com/rust-lang-nursery/failure/pull/343 is released.
+failure = { git = "https://github.com/grokse/failure", branch = "build_quote_103" }
 
 [profile.release]
 panic = "abort"