Update Rust runtime version check to reflect that v34 will be the first stable release

Note that this change would break the v33 release if it landed on the 33.x
branch. This is because the logic now treats v33 gencode as incompatible with
the runtime. However, this is fine since the 33.x branch cut has already been
done and we are not going to cherry-pick this change.

PiperOrigin-RevId: 816785840

Author: Adam Cozzette

rust/internal.rs

@@ -91,14 +91,14 @@ const fn split_version(version: &str) -> (u32, u32, u32, u32) {
 
 // Indicates whether the given gencode and runtime versions are compatible with
 // each other. Generally they are compatible if the gencode is no newer than the
-// runtime, but the exception is that we consider gencode at 4.32 and older to
+// runtime, but the exception is that we consider gencode at 4.33 and older to
 // be incompatible no matter what.
 #[cfg(not(bzl))]
 const fn are_versions_compatible(gencode: &str, runtime: &str) -> bool {
     let gencode = split_version(gencode);
     let runtime = split_version(runtime);
 
-    if gencode.0 < 4 || (gencode.0 == 4 && gencode.1 <= 32) {
+    if gencode.0 < 4 || (gencode.0 == 4 && gencode.1 <= 33) {
         return false;
     }
 
@@ -125,12 +125,12 @@ const fn are_versions_compatible(gencode: &str, runtime: &str) -> bool {
 /// the current runtime version. We require that the generated code cannot be
 /// newer than the runtime version.
 ///
-/// 4.33 is the first stable release, so any gencode older than that is not
+/// 4.34 is the first stable release, so any gencode older than that is not
 /// compatible going forward.
 ///
 /// If you are seeing this fail, it means that your generated code was built
 /// with a protoc version newer than the runtime crate version (or you have
-/// pre-4.33 gencode).
+/// pre-4.34 gencode).
 #[cfg(not(bzl))]
 pub const fn assert_compatible_gencode_version(gencode_version: &'static str) {
     let runtime_version = env!("CARGO_PKG_VERSION");
@@ -161,26 +161,26 @@ mod tests {
 
     #[gtest]
     fn test_are_versions_compatible() {
-        // Pre-4.33 gencode is never considered compatible.
-        expect_false!(are_versions_compatible("4.32.0", "4.32.1"));
-        expect_false!(are_versions_compatible("3.32.0", "3.32.0"));
+        // Pre-4.34 gencode is never considered compatible.
+        expect_false!(are_versions_compatible("4.33.0", "4.33.1"));
+        expect_false!(are_versions_compatible("3.33.0", "3.33.0"));
 
         // Otherwise, exact matches are always fine.
-        expect_true!(are_versions_compatible("4.33.0-rc.1", "4.33.0-rc.1"));
-        expect_true!(are_versions_compatible("4.33.1", "4.33.1"));
+        expect_true!(are_versions_compatible("4.34.0-rc.1", "4.34.0-rc.1"));
+        expect_true!(are_versions_compatible("4.34.1", "4.34.1"));
 
         // Gencode older than the runtime is also fine.
-        expect_true!(are_versions_compatible("4.33.0", "5.34.0"));
-        expect_true!(are_versions_compatible("4.33.0", "4.34.0"));
-        expect_true!(are_versions_compatible("4.33.0", "4.33.1"));
-        expect_true!(are_versions_compatible("4.33.0-rc.1", "4.33.0-rc.2"));
-        expect_true!(are_versions_compatible("4.33.0-rc.2", "4.33.0"));
+        expect_true!(are_versions_compatible("4.34.0", "5.35.0"));
+        expect_true!(are_versions_compatible("4.34.0", "4.35.0"));
+        expect_true!(are_versions_compatible("4.34.0", "4.34.1"));
+        expect_true!(are_versions_compatible("4.34.0-rc.1", "4.34.0-rc.2"));
+        expect_true!(are_versions_compatible("4.34.0-rc.2", "4.34.0"));
 
         // Gencode newer than the runtime is not allowed.
-        expect_false!(are_versions_compatible("5.34.0", "4.33.0"));
-        expect_false!(are_versions_compatible("4.34.0", "4.33.0"));
-        expect_false!(are_versions_compatible("4.33.1", "4.33.0"));
-        expect_false!(are_versions_compatible("4.33.0-rc.2", "4.33.0-rc.1"));
-        expect_false!(are_versions_compatible("4.33.0", "4.33.0-rc.2"));
+        expect_false!(are_versions_compatible("5.35.0", "4.34.0"));
+        expect_false!(are_versions_compatible("4.35.0", "4.34.0"));
+        expect_false!(are_versions_compatible("4.35.1", "4.34.0"));
+        expect_false!(are_versions_compatible("4.35.0-rc.2", "4.34.0-rc.1"));
+        expect_false!(are_versions_compatible("4.35.0", "4.34.0-rc.2"));
     }
 }