Work around crates.io feature name limits.

crates.io currently rejects features with a "." even though they are
accepted by `cargo`/`rustc`. Change the `1.20.0` feature to `1_20_0`.
rust-lang/crates.io#1395

Author: iliekturtles

.travis.yml

@@ -25,18 +25,18 @@ matrix:
     - rust: nightly
 
 before_script: |
-  test "$TRAVIS_RUST_VERSION" != "stable" ||
+  test "${TRAVIS_RUST_VERSION//./_}" != "stable" ||
   (test -x /home/travis/.cargo/bin/cargo-coveralls || cargo install cargo-travis) ||
   (test $(grep "cargo-travis" /home/travis/.cargo/.crates.toml | sed -r "s/\"cargo-travis ([^\ ]+).+/\1/") = $(cargo search cargo-travis --limit 1 | sed -r "s/cargo-travis \(([^\)]+)\).+/\1/") || cargoo install cargo-travis --force)
 
 script: |
   cargo build --verbose --no-default-features --features "autoconvert usize u8 u16 u32 u64 isize i8 i16 i32 i64 bigint biguint rational rational32 rational64 bigrational f32 f64 si std use_serde" &&
-  cargo test --verbose --no-run --no-default-features --features "autoconvert usize u8 u16 u32 u64 isize i8 i16 i32 i64 bigint biguint rational rational32 rational64 bigrational f32 f64 std use_serde $TRAVIS_RUST_VERSION" &&
-  cargo test --verbose --features "use_serde $TRAVIS_RUST_VERSION" &&
-  cargo test --manifest-path tests/feature_check/Cargo.toml --verbose --features "$TRAVIS_RUST_VERSION"
+  cargo test --verbose --no-run --no-default-features --features "autoconvert usize u8 u16 u32 u64 isize i8 i16 i32 i64 bigint biguint rational rational32 rational64 bigrational f32 f64 std use_serde ${TRAVIS_RUST_VERSION//./_}" &&
+  cargo test --verbose --features "use_serde ${TRAVIS_RUST_VERSION//./_}" &&
+  cargo test --manifest-path tests/feature_check/Cargo.toml --verbose --features "${TRAVIS_RUST_VERSION//./_}"
 
 after_success: |
-  test "$TRAVIS_RUST_VERSION" != "stable" || cargo coveralls
+  test "${TRAVIS_RUST_VERSION//./_}" != "stable" || cargo coveralls
 
 notifications:
   email:

Cargo.toml

@@ -65,7 +65,7 @@ use_serde = ["serde"]
 # Internal features to support channel specific test logic. Note that a
 # channel's feature must be added to the `--features` list when compiling
 # manually as no channel detection is build into `cargo`/`rustc`.
-"1.20.0" = []
+1_20_0 = []
 stable = []
 beta = []
 nightly = []

src/system.rs

@@ -192,8 +192,8 @@ macro_rules! system {
         ///
         /// Using units for the wrong quantity will cause a compile error:
         ///
-        #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1.20.0")), doc = " ```rust,compile_fail")]
-        #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1.20.0"))), doc = " ```rust,ignore")]
+        #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1_20_0")), doc = " ```rust,compile_fail")]
+        #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1_20_0"))), doc = " ```rust,ignore")]
         /// # use uom::si::f32::*;
         /// # use uom::si::time::second;
         /// // error[E0277]: the trait bound `second: length::Unit` is not satisfied
@@ -202,17 +202,17 @@ macro_rules! system {
         ///
         /// Mixing quantities will also cause a compile error:
         ///
-        #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1.20.0")), doc = " ```rust,compile_fail")]
-        #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1.20.0"))), doc = " ```rust,ignore")]
+        #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1_20_0")), doc = " ```rust,compile_fail")]
+        #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1_20_0"))), doc = " ```rust,ignore")]
         /// # use uom::si::f32::*;
         /// # use uom::si::length::meter;
         /// # use uom::si::time::second;
         /// // error[E0308]: mismatched types
         /// let r = Length::new::<meter>(1.0) + Time::new::<second>(1.0);
         /// ```
         ///
-        #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1.20.0")), doc = " ```rust,compile_fail")]
-        #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1.20.0"))), doc = " ```rust,ignore")]
+        #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1_20_0")), doc = " ```rust,compile_fail")]
+        #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1_20_0"))), doc = " ```rust,ignore")]
         /// # use uom::si::f32::*;
         /// # use uom::si::length::meter;
         /// # use uom::si::time::second;
@@ -576,8 +576,8 @@ macro_rules! system {
             ///
             /// The input type must have dimensions divisible by three:
             ///
-            #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1.20.0")), doc = " ```rust,compile_fail")]
-            #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1.20.0"))), doc = " ```rust,ignore")]
+            #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1_20_0")), doc = " ```rust,compile_fail")]
+            #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1_20_0"))), doc = " ```rust,ignore")]
             /// # use uom::si::f32::*;
             /// # use uom::si::area::square_meter;
             /// // error[E0271]: type mismatch resolving ...
@@ -737,8 +737,8 @@ macro_rules! system {
             ///
             /// The input type must have dimensions divisible by two:
             ///
-            #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1.20.0")), doc = " ```rust,compile_fail")]
-            #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1.20.0"))), doc = " ```rust,ignore")]
+            #[cfg_attr(all(feature = "si", feature = "f32", not(feature = "1_20_0")), doc = " ```rust,compile_fail")]
+            #[cfg_attr(not(all(feature = "si", feature = "f32", not(feature = "1_20_0"))), doc = " ```rust,ignore")]
             /// # use uom::si::f32::*;
             /// # use uom::si::length::meter;
             /// // error[E0271]: type mismatch resolving ...

tests/feature_check/Cargo.toml

@@ -10,7 +10,7 @@ default = []
 # Internal features to support channel specific test logic. Note that a
 # channel's feature must be added to the `--features` list when compiling
 # manually as no channel detection is build into `cargo`/`rustc`.
-"1.20.0" = []
+1_20_0 = []
 stable = []
 beta = []
 nightly = []

tests/feature_check/src/lib.rs

@@ -21,8 +21,8 @@
 //!
 //! Validate that `storage_types!` does not generate code for the `i32` type.
 //!
-#![cfg_attr(not(feature = "1.20.0"), doc = " ```rust,compile_fail")]
-#![cfg_attr(feature = "1.20.0", doc = " ```rust,ignore")]
+#![cfg_attr(not(feature = "1_20_0"), doc = " ```rust,compile_fail")]
+#![cfg_attr(feature = "1_20_0", doc = " ```rust,ignore")]
 //! #[macro_use]
 //! extern crate uom;
 //!