io: Update defmt to 1.0, rename feature from "defmt_03" to "defmt"

Author: chrysn

.github/workflows/test.yml

@@ -36,7 +36,7 @@ jobs:
           cargo build
           --workspace
           --target thumbv7m-none-eabi
-          --features async,defmt-03
+          --features async,defmt-03,defmt
 
   msrv-1-81:
     runs-on: ubuntu-latest

embedded-io/Cargo.toml

@@ -15,10 +15,10 @@ categories = [
 [features]
 std = ["alloc"]
 alloc = []
-defmt-03 = ["dep:defmt-03"]
+defmt = ["dep:defmt"]
 
 [dependencies]
-defmt-03 = { package = "defmt", version = "0.3", optional = true }
+defmt = { version = "1.0.0", optional = true }
 
 [package.metadata.docs.rs]
 features = ["std"]

embedded-io/src/lib.rs

@@ -5,9 +5,9 @@
 
 use core::fmt;
 
-// needed to prevent defmt macros from breaking, since they emit code that does `defmt::blahblah`.
-#[cfg(feature = "defmt-03")]
-use defmt_03 as defmt;
+// Note that defmt macros depend on this being named "defmt" precisely, since they emit code that does `defmt::blahblah`.
+#[cfg(feature = "defmt")]
+use defmt;
 
 #[cfg(feature = "alloc")]
 extern crate alloc;
@@ -18,7 +18,7 @@ mod impls;
 ///
 /// This is the `embedded-io` equivalent of [`std::io::SeekFrom`].
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum SeekFrom {
     /// Sets the offset to the provided number of bytes.
     Start(u64),
@@ -62,7 +62,7 @@ impl From<std::io::SeekFrom> for SeekFrom {
 ///
 /// - `WouldBlock` is removed, since `embedded-io` traits are always blocking. See the [crate-level documentation](crate) for details.
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[non_exhaustive]
 pub enum ErrorKind {
     /// Unspecified error kind.
@@ -229,7 +229,7 @@ impl<T: ?Sized + ErrorType> ErrorType for &mut T {
 
 /// Error returned by [`Read::read_exact`]
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum ReadExactError<E> {
     /// An EOF error was encountered before reading the exact amount of requested bytes.
     UnexpectedEof,
@@ -267,7 +267,7 @@ impl<E: fmt::Debug> core::error::Error for ReadExactError<E> {}
 
 /// Errors that could be returned by `Write` on `&mut [u8]`.
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[non_exhaustive]
 pub enum SliceWriteError {
     /// The target slice was full and so could not receive any new data.
@@ -276,7 +276,7 @@ pub enum SliceWriteError {
 
 /// Error returned by [`Write::write_fmt`]
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
-#[cfg_attr(feature = "defmt-03", derive(defmt::Format))]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum WriteFmtError<E> {
     /// An error was encountered while formatting.
     FmtError,