From bdbfa8ef5fdbf1f79838cddaadc28599e56ca0c6 Mon Sep 17 00:00:00 2001
From: Stephen Chung <schungx@live.com>
Date: Sun, 12 Sep 2021 21:06:13 +0800
Subject: [PATCH] Catch mutually exclusive features.

---
 Cargo.toml |  2 +-
 src/lib.rs | 20 ++++++++++++++------
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index bf0a805f..f360c3ef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,7 +49,7 @@ wasm-bindgen = ["instant/wasm-bindgen"]
 stdweb = ["instant/stdweb"]
 
 # internal feature flags - volatile
-no_smartstring = []             # Do not use SmartString
+no_smartstring = []             # do not use SmartString
 
 [profile.release]
 lto = "fat"
diff --git a/src/lib.rs b/src/lib.rs
index b21ff361..f3a0af66 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -325,24 +325,32 @@ pub(crate) type SmartString = String;
 
 #[cfg(feature = "no_float")]
 #[cfg(feature = "f32_float")]
-compile_error!("'f32_float' cannot be used with 'no_float'");
+compile_error!("`f32_float` cannot be used with `no_float`");
+
+#[cfg(feature = "only_i32")]
+#[cfg(feature = "only_i64")]
+compile_error!("`only_i32` and `only_i64` cannot be used together");
 
 #[cfg(feature = "no_std")]
 #[cfg(feature = "wasm-bindgen")]
-compile_error!("'wasm-bindgen' cannot be used with 'no-std'");
+compile_error!("`wasm-bindgen` cannot be used with `no-std`");
 
 #[cfg(feature = "no_std")]
 #[cfg(feature = "stdweb")]
-compile_error!("'stdweb' cannot be used with 'no-std'");
+compile_error!("`stdweb` cannot be used with `no-std`");
 
 #[cfg(any(target_arch = "wasm32", target_arch = "wasm64"))]
 #[cfg(feature = "no_std")]
-compile_error!("'no_std' cannot be used for WASM target");
+compile_error!("`no_std` cannot be used for WASM target");
 
 #[cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))]
 #[cfg(feature = "wasm-bindgen")]
-compile_error!("'wasm-bindgen' should not be used non-WASM target");
+compile_error!("`wasm-bindgen` cannot be used for non-WASM target");
 
 #[cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))]
 #[cfg(feature = "stdweb")]
-compile_error!("'stdweb' should not be used non-WASM target");
+compile_error!("`stdweb` cannot be used non-WASM target");
+
+#[cfg(feature = "wasm-bindgen")]
+#[cfg(feature = "stdweb")]
+compile_error!("`wasm-bindgen` and `stdweb` cannot be used together");