refactor(params): make LibEVMVersion a constant (#162)

> [!NOTE]
> This will be merged into `main` once the current target branch has
been merged.

## Why this should be merged

My original implementation was back to front and it's been bugging me.

## How this works

Originally `params.LibEVMVersion` was a `var` (because it needed to be
computed) and the test used a `const`. This change simply inverts the
two and moves some code around without any change in logic.

I bumped the minor version to 2 (a no-op when not on a release branch)
to bring it in line with the latest release candidate and to avoid
forgetting to do so when performing an actual release.

## How this was tested

Unit test of version-string constant.

.github/workflows/go.yml

@@ -5,8 +5,6 @@ on:
     branches: [main, "release/**"]
   pull_request:
     branches: [main, "release/**"]
-  merge_group:
-    types: [checks_requested]
   workflow_dispatch:
 
 concurrency:

.github/workflows/libevm-delta.yml

@@ -5,8 +5,6 @@ on:
     branches: [main, "release/**"]
   pull_request:
     branches: [main, "release/**"]
-  merge_group:
-    types: [checks_requested]
   workflow_dispatch:
 
 concurrency:

.github/workflows/lint.yml

@@ -5,8 +5,6 @@ on:
     branches: [main, "release/**"]
   pull_request:
     branches: [main, "release/**"]
-  merge_group:
-    types: [checks_requested]
   workflow_dispatch:
 
 permissions:

core/types/rlp_payload.libevm.go

@@ -20,7 +20,6 @@ import (
 	"fmt"
 	"io"
 
-	"github.com/ava-labs/libevm/common"
 	"github.com/ava-labs/libevm/libevm/pseudo"
 	"github.com/ava-labs/libevm/libevm/register"
 	"github.com/ava-labs/libevm/libevm/testonly"
@@ -366,8 +365,3 @@ func (e *StateAccountExtra) Format(s fmt.State, verb rune) {
 	}
 	_, _ = s.Write([]byte(out))
 }
-
-// RLPHash returns the hash of the RLP encoding of `x`.
-func RLPHash(x any) common.Hash {
-	return rlpHash(x)
-}

params/version.libevm.go

@@ -16,11 +16,9 @@
 
 package params
 
-import "fmt"
-
 const (
 	LibEVMVersionMajor = 0
-	LibEVMVersionMinor = 1
+	LibEVMVersionMinor = 2
 	LibEVMVersionPatch = 0
 
 	LibEVMReleaseType      ReleaseType = BetaRelease
@@ -50,23 +48,7 @@ const (
 // triplet.
 //
 // [semver v2]: https://semver.org/
-var LibEVMVersion = func() string {
-	v := libEVMSemver{
-		geth:   semverTriplet{VersionMajor, VersionMinor, VersionPatch},
-		libEVM: semverTriplet{LibEVMVersionMajor, LibEVMVersionMinor, LibEVMVersionPatch},
-		typ:    LibEVMReleaseType,
-		rc:     libEVMReleaseCandidate,
-	}
-	return v.String()
-}()
-
-type semverTriplet struct {
-	major, minor, patch uint
-}
-
-func (t semverTriplet) String() string {
-	return fmt.Sprintf("%d.%d.%d", t.major, t.minor, t.patch)
-}
+const LibEVMVersion = "1.13.14-0.2.0.beta"
 
 // A ReleaseType is a suffix for [LibEVMVersion].
 type ReleaseType string
@@ -86,17 +68,3 @@ const (
 func (t ReleaseType) ForReleaseBranch() bool {
 	return t == ReleaseCandidate || t == ProductionRelease
 }
-
-type libEVMSemver struct {
-	geth, libEVM semverTriplet
-	typ          ReleaseType
-	rc           uint
-}
-
-func (v libEVMSemver) String() string {
-	suffix := v.typ
-	if suffix == ReleaseCandidate {
-		suffix = ReleaseType(fmt.Sprintf("%s.%d", suffix, v.rc))
-	}
-	return fmt.Sprintf("%s-%s.%s", v.geth, v.libEVM, suffix)
-}

params/version.libevm_test.go

@@ -17,22 +17,47 @@
 package params
 
 import (
+	"fmt"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
 	"golang.org/x/mod/semver"
 )
 
-func TestLibEVMVersioning(t *testing.T) {
-	// We have an unusual version structure as defined by [LibEVMVersion] that
-	// is easy to mess up, so it's easier to just automate it and test the
-	// ordering assumptions.
+// libEVMServer automates the version rules described by the [LibEVMVersion]
+// documentation.
+type libEVMSemver struct {
+	geth, libEVM semverTriplet
+	typ          ReleaseType
+	rc           uint
+}
 
-	// This is a deliberate change-detector test to provide us with a copyable
-	// string of the current version, useful for git tagging.
-	const curr = "1.13.14-0.1.0.beta"
-	if got, want := LibEVMVersion, curr; got != want {
-		t.Errorf("got LibEVMVersion %q; want %q", got, want)
+func (v libEVMSemver) String() string {
+	suffix := v.typ
+	if suffix == ReleaseCandidate {
+		suffix = ReleaseType(fmt.Sprintf("%s.%d", suffix, v.rc))
 	}
+	return fmt.Sprintf("%s-%s.%s", v.geth, v.libEVM, suffix)
+}
+
+type semverTriplet struct {
+	major, minor, patch uint
+}
+
+func (t semverTriplet) String() string {
+	return fmt.Sprintf("%d.%d.%d", t.major, t.minor, t.patch)
+}
+
+func TestLibEVMVersioning(t *testing.T) {
+	t.Run("current", func(t *testing.T) {
+		want := libEVMSemver{
+			geth:   semverTriplet{VersionMajor, VersionMinor, VersionPatch},
+			libEVM: semverTriplet{LibEVMVersionMajor, LibEVMVersionMinor, LibEVMVersionPatch},
+			typ:    LibEVMReleaseType,
+			rc:     libEVMReleaseCandidate,
+		}.String()
+		assert.Equal(t, want, LibEVMVersion, "LibEVMVersion")
+	})
 
 	ordered := []libEVMSemver{
 		{