CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to insta and cargo-insta are documented here.
 
+## 1.18.2
+
+- Avoid the use of `#[allow(unused)]` in the macro. (#271)
+
 ## 1.18.1
 
 - Fixed a regression in the JSON serialization format with newtypes and

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "insta"
-version = "1.18.1"
+version = "1.18.2"
 license = "Apache-2.0"
 authors = ["Armin Ronacher <armin.ronacher@active-4.com>"]
 description = "A snapshot testing library for Rust"

cargo-insta/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cargo-insta"
-version = "1.18.1"
+version = "1.18.2"
 license = "Apache-2.0"
 authors = ["Armin Ronacher <armin.ronacher@active-4.com>"]
 description = "A review tool for the insta snapshot testing library for Rust"
@@ -12,7 +12,7 @@ edition = "2018"
 readme = "README.md"
 
 [dependencies]
-insta = { version = "=1.18.1", path = "..", features = ["json", "yaml", "redactions"] }
+insta = { version = "=1.18.2", path = "..", features = ["json", "yaml", "redactions"] }
 console = "0.15.1"
 structopt = "0.3.20"
 serde = { version = "1.0.117", features = ["derive"] }

src/lib.rs

@@ -291,7 +291,7 @@ pub mod _macro_support {
     )
 )]
 pub mod deprecated_backtrace_support {
-    pub const _BACKTRACE_DUMMY: usize = 0;
+    pub fn backtrace_dummy() {}
 }
 
 #[doc(hidden)]
@@ -308,5 +308,5 @@ pub mod deprecated_backtrace_support {
     )
 )]
 pub mod deprecated_serialization_support {
-    pub const _SERIALIZATION_DUMMY: usize = 0;
+    pub fn serialization_dummy() {}
 }

src/macros.rs

@@ -418,11 +418,13 @@ macro_rules! assert_snapshot {
     };
     ($name:expr, $value:expr, $debug_expr:expr) => {{
         // This use does not do anything.  It exists purely to trigger a deprecation warning
-        // for the features if enabled.
-        #[allow(unused)]
+        // for the features if enabled.  The dummy function calls exist so that we do not
+        // need to use `#[allow(unused)]` (https://github.com/mitsuhiko/insta/issues/271)
         {
             use $crate::deprecated_backtrace_support::*;
             use $crate::deprecated_serialization_support::*;
+            backtrace_dummy();
+            serialization_dummy();
         }
 
         $crate::_macro_support::assert_snapshot(