Increase MSRV to Rust 1.64.0

Author: bluss

.github/workflows/ci.yaml

@@ -50,7 +50,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - 1.57.0  # MSRV
+          - 1.64.0  # MSRV
 
     name: tests/${{ matrix.rust }}
     steps:

Cargo.toml

@@ -3,7 +3,7 @@
 name = "ndarray"
 version = "0.15.6"
 edition = "2018"
-rust-version = "1.57"
+rust-version = "1.64"
 authors = [
   "Ulrik Sverdrup \"bluss\"",
   "Jim Turner"

scripts/all-tests.sh

@@ -6,25 +6,6 @@ set -e
 FEATURES=$1
 CHANNEL=$2
 
-if [ "$CHANNEL" = "1.57.0" ]; then
-    cargo update --package openblas-src --precise 0.10.5
-    cargo update --package openblas-build --precise 0.10.5
-    cargo update --package once_cell --precise 1.14.0
-    cargo update --package byteorder --precise 1.4.3
-    cargo update --package rayon --precise 1.5.3
-    cargo update --package rayon-core --precise 1.9.3
-    cargo update --package crossbeam-channel --precise 0.5.8
-    cargo update --package crossbeam-deque --precise 0.8.3
-    cargo update --package crossbeam-epoch --precise 0.9.15
-    cargo update --package crossbeam-utils --precise 0.8.16
-    cargo update --package rmp --precise 0.8.11
-    cargo update --package serde_json --precise 1.0.99
-    cargo update --package serde --precise 1.0.156
-    cargo update --package thiserror --precise 1.0.39
-    cargo update --package quote --precise 1.0.30
-    cargo update --package proc-macro2 --precise 1.0.65
-fi
-
 cargo build --verbose --no-default-features
 # Testing both dev and release profiles helps find bugs, especially in low level code
 cargo test --verbose --no-default-features

src/lib.rs

@@ -72,7 +72,8 @@
 //!     needs matching memory layout to be efficient (with some exceptions).
 //!   + Efficient floating point matrix multiplication even for very large
 //!     matrices; can optionally use BLAS to improve it further.
-//! - **Requires Rust 1.57 or later**
+//!
+//! - **MSRV: Requires Rust 1.64 or later**
 //!
 //! ## Crate Feature Flags
 //!

xtest-serialization/Cargo.toml

@@ -20,9 +20,14 @@ default-features = false
 [dev-dependencies.serde_json]
 version = "1.0.40"
 
+[dev-dependencies.rmp]
+# Old version to work with Rust 1.64+
+version = "=0.8.10"
+
 [dev-dependencies.rmp-serde]
-version = "0.14.0"
+# Old version to work with Rust 1.64+
+version = "0.14"
 
 [dependencies.ron]
-version = "0.5.1"
+version = "0.8.1"
 optional = true