Bump MSRV to rustc 1.63.0

.. which is a reasonable common ground, also supported by Debian stable.

.github/workflows/build.yml

@@ -18,19 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         platform: [ ubuntu-latest, windows-latest, macos-latest ]
-        toolchain: [ stable, beta ]
-        include:
-          - toolchain: stable
-            platform: ubuntu-latest
-          # 1.48.0 is the MSRV for all crates except lightning-transaction-sync and Win/Mac
-          - toolchain: 1.48.0
-            platform: ubuntu-latest
-          # Windows requires 1.49.0 because that's the MSRV for supported Tokio
-          - toolchain: 1.49.0
-            platform: windows-latest
-          # MacOS-latest requires 1.54.0 because that's what's required for linking to work properly
-          - toolchain: 1.54.0
-            platform: macos-latest
+        toolchain: [ stable, beta, 1.63.0 ] # 1.63.0 is the MSRV for all crates.
     runs-on: ${{ matrix.platform }}
     steps:
       - name: Checkout source code

CONTRIBUTING.md

@@ -88,7 +88,7 @@ be covered by functional tests.
 When refactoring, structure your PR to make it easy to review and don't
 hesitate to split it into multiple small, focused PRs.
 
-The Minimum Supported Rust Version (MSRV) currently is 1.41.1 (enforced by
+The Minimum Supported Rust Version (MSRV) currently is 1.63.0 (enforced by
 our GitHub Actions). Also, the compatibility for LDK object serialization is
 currently ensured back to and including crate version 0.0.99 (see the
 [changelog](CHANGELOG.md)).

ci/ci-tests.sh

@@ -8,39 +8,16 @@ HOST_PLATFORM="$(rustc --version --verbose | grep "host:" | awk '{ print $2 }')"
 # which we do here.
 # Further crates which appear only as dev-dependencies are pinned further down.
 function PIN_RELEASE_DEPS {
-	# Tokio MSRV on versions 1.17 through 1.26 is rustc 1.49. Above 1.26 MSRV is 1.56.
-	[ "$RUSTC_MINOR_VERSION" -lt 49 ] && cargo update -p tokio --precise "1.14.1" --verbose
-	[[ "$RUSTC_MINOR_VERSION" -gt 48  &&  "$RUSTC_MINOR_VERSION" -lt 56 ]] && cargo update -p tokio --precise "1.25.1" --verbose
-
-	# Sadly the log crate is always a dependency of tokio until 1.20, and has no reasonable MSRV guarantees
-	[ "$RUSTC_MINOR_VERSION" -lt 49 ] && cargo update -p log --precise "0.4.18" --verbose
-
-	# The serde_json crate switched to Rust edition 2021 starting with v1.0.101, i.e., has MSRV of 1.56
-	[ "$RUSTC_MINOR_VERSION" -lt 56 ] && cargo update -p serde_json --precise "1.0.100" --verbose
+	# Starting with version 1.10.0, the `regex` crate has an MSRV of rustc 1.65.0.
+	[ "$RUSTC_MINOR_VERSION" -lt 65 ] && cargo update -p regex --precise "1.9.6" --verbose
 
+	# The addr2line v0.21 crate (a dependency of `backtrace` starting with 0.3.69) relies on rustc 1.65
+	[ "$RUSTC_MINOR_VERSION" -lt 65 ] && cargo update -p backtrace --precise "0.3.68" --verbose
 	return 0 # Don't fail the script if our rustc is higher than the last check
 }
 
 PIN_RELEASE_DEPS # pin the release dependencies in our main workspace
 
-# The addr2line v0.20 crate (a dependency of `backtrace` starting with 0.3.68) relies on 1.55+
-[ "$RUSTC_MINOR_VERSION" -lt 55 ] && cargo update -p backtrace --precise "0.3.67" --verbose
-
-# The quote crate switched to Rust edition 2021 starting with v1.0.31, i.e., has MSRV of 1.56
-[ "$RUSTC_MINOR_VERSION" -lt 56 ] && cargo update -p quote --precise "1.0.30" --verbose
-
-# The syn crate depends on too-new proc-macro2 starting with v2.0.33, i.e., has MSRV of 1.56
-if [ "$RUSTC_MINOR_VERSION" -lt 56 ]; then
-	SYN_2_DEP=$(grep -o '"syn 2.*' Cargo.lock | tr -d '",' | tr ' ' ':')
-	cargo update -p "$SYN_2_DEP" --precise "2.0.32" --verbose
-fi
-
-# The proc-macro2 crate switched to Rust edition 2021 starting with v1.0.66, i.e., has MSRV of 1.56
-[ "$RUSTC_MINOR_VERSION" -lt 56 ] && cargo update -p proc-macro2 --precise "1.0.65" --verbose
-
-# The memchr crate switched to an MSRV of 1.60 starting with v2.6.0
-[ "$RUSTC_MINOR_VERSION" -lt 60 ] && cargo update -p memchr --precise "2.5.0" --verbose
-
 export RUST_BACKTRACE=1
 
 echo -e "\n\nBuilding and testing all workspace crates..."
@@ -76,20 +53,16 @@ pushd lightning-background-processor
 cargo test --verbose --color always --features futures
 popd
 
-if [ "$RUSTC_MINOR_VERSION" -gt 55 ]; then
-	echo -e "\n\nTest Custom Message Macros"
-	pushd lightning-custom-message
-	cargo test --verbose --color always
-	[ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean
-	popd
-fi
+echo -e "\n\nTest Custom Message Macros"
+pushd lightning-custom-message
+cargo test --verbose --color always
+[ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean
+popd
 
-if [ "$RUSTC_MINOR_VERSION" -gt 51 ]; then # Current `object` MSRV, subject to change
-	echo -e "\n\nTest backtrace-debug builds"
-	pushd lightning
-	cargo test --verbose --color always --features backtrace
-	popd
-fi
+echo -e "\n\nTest backtrace-debug builds"
+pushd lightning
+cargo test --verbose --color always --features backtrace
+popd
 
 echo -e "\n\nBuilding with all Log-Limiting features"
 pushd lightning
@@ -100,13 +73,14 @@ popd
 
 echo -e "\n\nTesting no-std flags in various combinations"
 for DIR in lightning lightning-invoice lightning-rapid-gossip-sync; do
-	[ "$RUSTC_MINOR_VERSION" -gt 50 ] && cargo test -p $DIR --verbose --color always --no-default-features --features no-std
+	cargo test -p $DIR --verbose --color always --no-default-features --features no-std
 	# check if there is a conflict between no-std and the default std feature
-	[ "$RUSTC_MINOR_VERSION" -gt 50 ] && cargo test -p $DIR --verbose --color always --features no-std
+	cargo test -p $DIR --verbose --color always --features no-std
 done
+
 for DIR in lightning lightning-invoice lightning-rapid-gossip-sync; do
 	# check if there is a conflict between no-std and the c_bindings cfg
-	[ "$RUSTC_MINOR_VERSION" -gt 50 ] && RUSTFLAGS="--cfg=c_bindings" cargo test -p $DIR --verbose --color always --no-default-features --features=no-std
+	RUSTFLAGS="--cfg=c_bindings" cargo test -p $DIR --verbose --color always --no-default-features --features=no-std
 done
 RUSTFLAGS="--cfg=c_bindings" cargo test --verbose --color always
 
@@ -130,7 +104,7 @@ else
 	# The memchr crate switched to an MSRV of 1.60 starting with v2.6.0
 	# This is currently only a release dependency via core2, which we intend to work with
 	# rust-bitcoin to remove soon.
-	[ "$RUSTC_MINOR_VERSION" -lt 60 ] && cargo update -p memchr --precise "2.5.0" --verbose
+	cargo update -p memchr --precise "2.5.0" --verbose
 	cargo check --verbose --color always
 fi
 [ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean

lightning-background-processor/src/lib.rs

@@ -2,9 +2,8 @@
 //! running properly, and (2) either can or should be run in the background. See docs for
 //! [`BackgroundProcessor`] for more details on the nitty-gritty.
 
-// Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
-#![deny(broken_intra_doc_links)]
-#![deny(private_intra_doc_links)]
+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(rustdoc::private_intra_doc_links)]
 
 #![deny(missing_docs)]
 #![cfg_attr(not(feature = "futures"), deny(unsafe_code))]

lightning-block-sync/src/lib.rs

@@ -13,9 +13,8 @@
 //! Both features support either blocking I/O using `std::net::TcpStream` or, with feature `tokio`,
 //! non-blocking I/O using `tokio::net::TcpStream` from inside a Tokio runtime.
 
-// Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
-#![deny(broken_intra_doc_links)]
-#![deny(private_intra_doc_links)]
+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(rustdoc::private_intra_doc_links)]
 
 #![deny(missing_docs)]
 #![deny(unsafe_code)]

lightning-invoice/src/lib.rs

@@ -1,6 +1,5 @@
-// Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
-#![deny(broken_intra_doc_links)]
-#![deny(private_intra_doc_links)]
+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(rustdoc::private_intra_doc_links)]
 
 #![deny(missing_docs)]
 #![deny(non_upper_case_globals)]

lightning-net-tokio/src/lib.rs

@@ -22,9 +22,8 @@
 //!
 //! [`PeerManager`]: lightning::ln::peer_handler::PeerManager
 
-// Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
-#![deny(broken_intra_doc_links)]
-#![deny(private_intra_doc_links)]
+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(rustdoc::private_intra_doc_links)]
 
 #![deny(missing_docs)]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]

lightning-persister/src/lib.rs

@@ -1,8 +1,7 @@
 //! Provides utilities for LDK data persistence and retrieval.
-//
-// TODO: Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
-#![deny(broken_intra_doc_links)]
-#![deny(private_intra_doc_links)]
+
+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(rustdoc::private_intra_doc_links)]
 
 #![deny(missing_docs)]
 

lightning-rapid-gossip-sync/src/lib.rs

@@ -1,6 +1,5 @@
-// Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
-#![deny(broken_intra_doc_links)]
-#![deny(private_intra_doc_links)]
+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(rustdoc::private_intra_doc_links)]
 
 #![deny(missing_docs)]
 #![deny(unsafe_code)]

lightning-transaction-sync/src/lib.rs

@@ -58,9 +58,8 @@
 //! [`ChainMonitor`]: lightning::chain::chainmonitor::ChainMonitor
 //! [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
 
-// Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
-#![deny(broken_intra_doc_links)]
-#![deny(private_intra_doc_links)]
+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(rustdoc::private_intra_doc_links)]
 
 #![deny(missing_docs)]
 #![deny(unsafe_code)]