Switch to 2021 edition

.clippy.toml

@@ -1 +1 @@
-msrv = "1.42.0"
+msrv = "1.56.0"

.github/workflows/ci.yml

@@ -32,17 +32,6 @@ jobs:
           toolchain: ${{matrix.rust}}
       - run: cargo test
 
-  msrv:
-    name: Rust 1.42.0
-    needs: pre_ci
-    if: needs.pre_ci.outputs.continue
-    runs-on: ubuntu-latest
-    timeout-minutes: 45
-    steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@1.42.0
-      - run: cargo check
-
   minimal:
     name: Minimal versions
     needs: pre_ci

Cargo.toml

@@ -5,11 +5,11 @@ authors = ["David Tolnay <dtolnay@gmail.com>"]
 categories = ["rust-patterns", "text-processing", "no-std"]
 description = "Indented document literals"
 documentation = "https://docs.rs/indoc"
-edition = "2018"
+edition = "2021"
 keywords = ["heredoc", "nowdoc", "multiline", "string", "literal"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/indoc"
-rust-version = "1.42"
+rust-version = "1.56"
 
 [lib]
 proc-macro = true

README.md

@@ -15,7 +15,7 @@ time so the leftmost non-space character is in the first column.
 indoc = "1.0"
 ```
 
-*Compiler requirement: rustc 1.42 or greater.*
+*Compiler requirement: rustc 1.56 or greater.*
 
 <br>
 

src/error.rs

@@ -1,5 +1,4 @@
 use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
-use std::iter::FromIterator;
 
 pub type Result<T> = std::result::Result<T, Error>;
 

src/lib.rs

@@ -125,7 +125,7 @@ use crate::error::{Error, Result};
 use crate::unindent::do_unindent;
 use proc_macro::token_stream::IntoIter as TokenIter;
 use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
-use std::iter::{self, FromIterator, Peekable};
+use std::iter::{self, Peekable};
 use std::str::FromStr;
 
 #[derive(Copy, Clone, PartialEq)]

unindent/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["David Tolnay <dtolnay@gmail.com>"]
 categories = ["text-processing"]
 description = "Remove a column of leading whitespace from a string"
 documentation = "https://docs.rs/unindent"
-edition = "2018"
+edition = "2021"
 keywords = ["heredoc", "nowdoc", "multiline", "string", "literal"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/indoc"