Wrong variable (blob) used instead of bin in buffer re-encode mismatch error

[KindKillerwhale]

Description

There's a minor but confusing bug in the ssz/tests/consensus_specs_test.go:fuzzConsensusSpecType function line:835. Specifically, in the buffer leftover path, we store the re-encoded bytes in a variable named bin, but the error message references a variable named blob (used in the stream leftover path). This leads to incorrect or misleading data being shown in the error logs.

Reference

File: tests/consensus_specs_test.go

bin := make([]byte, ssz.SizeOnFork(obj, ssz.ForkFuture))
if err := ssz.EncodeToBytesOnFork(bin, obj, ssz.ForkFuture); err != nil {
    t.Fatalf("failed to re-encode buffer from used object: %v", err)
}
if !bytes.Equal(bin, inSSZ) {
    prefix := commonPrefix(bin, inSSZ)
    t.Fatalf("re-encoded buffer from used object mismatch: have %x, want %x, common prefix %d, have left %x, want left %x",
        blob, inSSZ, len(prefix), bin[len(prefix):], inSSZ[len(prefix):])
}

Suggested Fix

Simply replace blob with bin in that error message. Here's a minimal patch:

 if !bytes.Equal(bin, inSSZ) {
     prefix := commonPrefix(bin, inSSZ)
    t.Fatalf("re-encoded buffer from used object mismatch: have %x, want %x, common prefix %d, have left %x, want left %x",
-        blob, inSSZ, len(prefix), bin[len(prefix):], inSSZ[len(prefix):])
+        bin, inSSZ, len(prefix), bin[len(prefix):], inSSZ[len(prefix):])
 }

This ensures the error message accurately shows the content of bin (the actual buffer re-encode), instead of the variable from the stream leftover path.