From d8c4d8fa83d1e91a780afb6368af2b2119da0271 Mon Sep 17 00:00:00 2001
From: Ivan Enderlin <ivan.enderlin@hoa-project.net>
Date: Thu, 2 Apr 2020 13:53:10 +0200
Subject: [PATCH] feat(interface-types) Make `serde` optional behind a feature
 flag.

---
 Cargo.toml                              | 9 ++++++++-
 src/interpreter/instructions/records.rs | 1 +
 src/interpreter/wasm/mod.rs             | 2 ++
 src/interpreter/wasm/values.rs          | 4 +++-
 4 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index f19b6ee..34e19c4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,4 +10,11 @@ edition = "2018"
 [dependencies]
 nom = "5.1"
 wast = "8.0"
-serde = { version = "1.0", features = ["derive"] }
\ No newline at end of file
+
+# `serde` is useful only to simplify the users' life. It is not
+# required by WIT itself, is is used to transform WIT values like
+# `record`s to Rust sum types.
+serde = { version = "1.0", features = ["derive"], optional = true }
+
+[features]
+default = ["serde"]
\ No newline at end of file
diff --git a/src/interpreter/instructions/records.rs b/src/interpreter/instructions/records.rs
index 9faebf1..9a248e8 100644
--- a/src/interpreter/instructions/records.rs
+++ b/src/interpreter/instructions/records.rs
@@ -214,6 +214,7 @@ mod tests {
             ])],
     );
 
+    #[cfg(feature = "serde")]
     #[test]
     #[allow(non_snake_case, unused)]
     fn test_record_lift__to_rust_struct() {
diff --git a/src/interpreter/wasm/mod.rs b/src/interpreter/wasm/mod.rs
index 8923d2f..539e5ff 100644
--- a/src/interpreter/wasm/mod.rs
+++ b/src/interpreter/wasm/mod.rs
@@ -2,6 +2,8 @@
 //! types, and traits —basically this is the part a runtime should
 //! take a look to use the `wasmer-interface-types` crate—.
 
+#[cfg(feature = "serde")]
 mod serde;
+
 pub mod structures;
 pub mod values;
diff --git a/src/interpreter/wasm/values.rs b/src/interpreter/wasm/values.rs
index 3895aa0..1ba005d 100644
--- a/src/interpreter/wasm/values.rs
+++ b/src/interpreter/wasm/values.rs
@@ -2,9 +2,11 @@
 
 pub use crate::ast::{InterfaceType, RecordType};
 use crate::errors::WasmValueNativeCastError;
-pub use crate::interpreter::wasm::serde::*;
 use std::{convert::TryFrom, slice::Iter};
 
+#[cfg(feature = "serde")]
+pub use crate::interpreter::wasm::serde::*;
+
 /// A WIT value.
 #[derive(Debug, Clone, PartialEq)]
 pub enum InterfaceValue {