Relax semver-checks to compare worlds in packages with different versions

crates/wit-component/src/semver_check.rs

@@ -55,7 +55,7 @@ pub fn semver_check(mut resolve: Resolve, prev: WorldId, new: WorldId) -> Result
         .package
         .context("new world not in named package")?;
     let new_pkg_name = &resolve.packages[new_pkg_id].name;
-    if old_pkg_id != new_pkg_id {
+    if old_pkg_name != new_pkg_name {
         bail!("the old world is in package {old_pkg_name}, which is not the same as the new world, which is in package {new_pkg_name}", )
     }
 

tests/cli/semver-check-different-package-versions.wit

@@ -0,0 +1,14 @@
+// FAIL: component semver-check % --prev a:b/[email protected] --new a:b/[email protected]
+
+package foo:root;
+package a:[email protected] {
+  world worldly {
+    import a: func();
+    import b: interface {}
+  }
+}
+
+package a:[email protected] {
+  world worldly {
+  }
+}

tests/cli/semver-check-different-package-versions.wit.stderr

@@ -0,0 +1,5 @@
+error: new world is not semver-compatible with the previous world
+
+Caused by:
+    0: type mismatch for import `worldly`
+       missing import named `a` (at offset 0x186)