diff --git a/source/cdcdb/cdc/cas.d b/source/cdcdb/cdc/cas.d
index e39128a..0a19508 100644
--- a/source/cdcdb/cdc/cas.d
+++ b/source/cdcdb/cdc/cas.d
@@ -131,7 +131,7 @@ public:
 		return idSnapshot;
 	}
 
-	Snapshot[] getSnapshots(string label = "")
+	Snapshot[] getSnapshots(string label = string.init)
 	{
 		return _db.getSnapshots(label);
 	}
@@ -178,7 +178,7 @@ public:
 		ok = true;
 	}
 
-	string getVersion() {
+	string getVersion() const @safe nothrow {
 		import cdcdb.version_;
 		return cdcdbVersion;
 	}
diff --git a/source/cdcdb/cdc/core.d b/source/cdcdb/cdc/core.d
index a5cbe19..d95f13d 100644
--- a/source/cdcdb/cdc/core.d
+++ b/source/cdcdb/cdc/core.d
@@ -13,7 +13,7 @@ private:
 	// _gear
 	mixin(import("gear.d"));
 
-	size_t cut(const(ubyte)[] src) @safe nothrow
+	size_t cut(const(ubyte)[] src) pure nothrow @safe @nogc
 	{
 		size_t size = src.length;
 		if (size == 0)
@@ -67,7 +67,7 @@ public:
 		_maskL = maskL;
 	}
 
-	Chunk[] split(const(ubyte)[] data) @safe
+	Chunk[] split(const(ubyte)[] data) @safe nothrow
 	{
 		Chunk[] chunks;
 		if (data.length == 0)
diff --git a/source/cdcdb/cdc/types.d b/source/cdcdb/cdc/types.d
index 8cd809d..cfede4c 100644
--- a/source/cdcdb/cdc/types.d
+++ b/source/cdcdb/cdc/types.d
@@ -6,5 +6,5 @@ struct Chunk
 	size_t index; // 1..N
 	size_t offset; // смещение в исходном буфере
 	size_t size; // размер чанка
-	ubyte[32] sha256; // hex(SHA-256) содержимого
+	immutable(ubyte)[32] sha256; // hex(SHA-256) содержимого
 }
diff --git a/test/app.d b/test/app.d
index 79829d4..919d8c8 100644
--- a/test/app.d
+++ b/test/app.d
@@ -7,7 +7,7 @@ import std.file : read;
 void main()
 {
 	auto cas = new CAS("/tmp/base.db", true);
-	cas.newSnapshot("/tmp/texts", cast(ubyte[]) read("/tmp/text"));
+	cas.newSnapshot("/tmp/text", cast(ubyte[]) read("/tmp/text"));
 	// import std.stdio : writeln;
 
 	foreach (snapshot; cas.getSnapshots()) {