From 3995ca71eca85dc6fa8584995944e3766b2ab623 Mon Sep 17 00:00:00 2001
From: Will Jones <willjones127@gmail.com>
Date: Fri, 15 May 2026 14:13:56 -0700
Subject: [PATCH] ci: downgrade aws-smithy-* in MSRV check

aws-runtime, aws-sigv4, aws-credential-types, and the aws-smithy-*
crates bumped their MSRV to 1.91.1 in late 2026, so they no longer
build on our pinned 1.91.0 MSRV. Pin them to the latest 1.91.0
compatible versions in the MSRV downgrade step.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 .github/workflows/rust.yml | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 937124f5a..f1a4d5f2d 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -233,6 +233,28 @@ jobs:
           cargo update -p aws-sdk-sso --precise 1.62.0
           cargo update -p aws-sdk-ssooidc --precise 1.63.0
           cargo update -p aws-sdk-sts --precise 1.63.0
+          # aws-runtime/sigv4/credential-types and the aws-smithy-* crates
+          # bumped their MSRV to 1.91.1 in late 2026; pin to the last
+          # 1.91.0-compatible versions. Order matters: aws-runtime / aws-sigv4
+          # / aws-credential-types are downgraded before the aws-smithy-*
+          # cluster so the constraint chain through aws-smithy-checksums →
+          # aws-smithy-http → aws-smithy-runtime-api / aws-smithy-types can
+          # actually unwind.
+          cargo update -p aws-runtime --precise 1.5.12
+          cargo update -p aws-sigv4 --precise 1.3.5
+          cargo update -p aws-credential-types --precise 1.2.8
+          cargo update -p aws-smithy-checksums --precise 0.63.9
+          cargo update -p aws-smithy-runtime --precise 1.9.3
+          cargo update -p aws-smithy-http --precise 0.62.4
+          cargo update -p aws-smithy-eventstream --precise 0.60.12
+          cargo update -p aws-smithy-runtime-api --precise 1.9.1
+          cargo update -p aws-smithy-async --precise 1.2.6
+          cargo update -p aws-smithy-types --precise 1.3.5
+          cargo update -p aws-smithy-http-client --precise 1.1.3
+          cargo update -p aws-smithy-observability --precise 0.1.4
+          cargo update -p aws-smithy-query --precise 0.60.8
+          cargo update -p aws-smithy-xml --precise 0.60.11
+          cargo update -p aws-types --precise 1.3.9
           cargo update -p home --precise 0.5.9
       - name: cargo +${{ matrix.msrv }} check
         env: