Update MSRV to 1.57

Author: jturner314

.github/workflows/ci.yaml

@@ -34,7 +34,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - 1.51.0  # MSRV
+          - 1.57.0  # MSRV
 
     name: tests/${{ matrix.rust }}
     steps:

Cargo.toml

@@ -3,7 +3,7 @@
 name = "ndarray"
 version = "0.15.6"
 edition = "2018"
-rust-version = "1.51"
+rust-version = "1.57"
 authors = [
   "Ulrik Sverdrup \"bluss\"",
   "Jim Turner"

scripts/all-tests.sh

@@ -6,7 +6,7 @@ set -e
 FEATURES=$1
 CHANNEL=$2
 
-if [ "$CHANNEL" = "1.51.0" ]; then
+if [ "$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

src/lib.rs

@@ -71,7 +71,7 @@
 //!     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 1.51 or later**
+//! - **Requires Rust 1.57 or later**
 //!
 //! ## Crate Feature Flags
 //!