Enforce only upper bound on Dist size

Cargo.toml

@@ -74,7 +74,6 @@ seahash = { version = "4.1.0" }
 serde = { version = "1.0.194" }
 serde_json = { version = "1.0.111" }
 sha2 = { version = "0.10.8" }
-static_assertions = { version = "1.1.0" }
 tar = { version = "0.4.40" }
 target-lexicon = { version = "0.12.13" }
 tempfile = { version = "3.9.0" }

crates/distribution-types/Cargo.toml

@@ -32,6 +32,5 @@ rustc-hash = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 sha2 = { workspace = true }
-static_assertions = { workspace = true }
 thiserror = { workspace = true }
 url = { workspace = true }

crates/distribution-types/src/lib.rs

@@ -37,7 +37,6 @@ use std::path::{Path, PathBuf};
 use std::str::FromStr;
 
 use anyhow::Result;
-use static_assertions::assert_eq_size;
 use url::Url;
 
 use distribution_filename::{DistFilename, SourceDistFilename, WheelFilename};
@@ -202,10 +201,6 @@ pub struct PathSourceDist {
     pub editable: bool,
 }
 
-assert_eq_size!(Dist, [u8; 240]);
-assert_eq_size!(BuiltDist, [u8; 240]);
-assert_eq_size!(SourceDist, [u8; 168]);
-
 impl Dist {
     /// Create a [`Dist`] for a registry-based distribution.
     pub fn from_registry(filename: DistFilename, file: File, index: IndexUrl) -> Self {
@@ -870,3 +865,16 @@ impl Identifier for Dist {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use crate::{BuiltDist, Dist, SourceDist};
+
+    /// Ensure that we don't accidentally grow the `Dist` sizes.
+    #[test]
+    fn dist_size() {
+        assert!(std::mem::size_of::<Dist>() <= 240);
+        assert!(std::mem::size_of::<BuiltDist>() <= 240);
+        assert!(std::mem::size_of::<SourceDist>() <= 168);
+    }
+}