diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5eabfe..ee5a34a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,7 +17,7 @@ cmake_minimum_required(VERSION 3.15...3.25)
 #    └─ test.c
 
 project(gemstone
-    VERSION 0.1.0
+    VERSION 0.2.6
     DESCRIPTION "programming language compiler"
     LANGUAGES C)
 
diff --git a/lib/src/io.gsc b/lib/src/io.gsc
index c729644..1adb655 100644
--- a/lib/src/io.gsc
+++ b/lib/src/io.gsc
@@ -14,6 +14,10 @@ include "def.gsc"
 #       which can lead to errors and undefined behavior
 type ptr: handle
 
+# NULL handle representing an invalid handle on
+# all platforms
+handle: nullHandle = 0 as handle
+
 # Returns a handle to this processes standard input I/O handle
 # -- Implementation note
 # On Linux this will return 0 as is it convention under UNIX (see: https://www.man7.org/linux/man-pages/man3/stdin.3.html)
diff --git a/lib/src/mem.gsc b/lib/src/mem.gsc
index b9df686..0060323 100644
--- a/lib/src/mem.gsc
+++ b/lib/src/mem.gsc
@@ -10,14 +10,14 @@ include "def.gsc"
 
 # Allocate `len` bytes of heap memory
 # Returns a pointer to the memory as `ptr`
-fun heap_alloc(in u32: len)(out ref u8: ptr)
+fun heapAlloc(in u32: len)(out ref u8: ptr)
 
 # Rellocate `len` bytes of heap memory
 # Returns a pointer to the memory as `ptr`
-fun heap_realloc(in u32: len, in out ref u8: ptr)
+fun heapRealloc(in u32: len, in out ref u8: ptr)
 
 # Free a block of memory
-fun heap_free(in ref u8: ptr)
+fun heapFree(in ref u8: ptr)
 
 # Copy `len` bytes from `dst` into `src`
 fun copy(in ref u8: dst, in ref u8: src, in u32: len)
diff --git a/lib/src/mem/api.h b/lib/src/mem/api.h
index 8ca69c0..00f1577 100644
--- a/lib/src/mem/api.h
+++ b/lib/src/mem/api.h
@@ -4,11 +4,11 @@
 
 #include <def/api.h>
 
-void heap_alloc(u32 len, u8** ptr);
+void heapAlloc(u32 len, u8** ptr);
 
-void heap_realloc(u32 len, u8** ptr);
+void heapRealloc(u32 len, u8** ptr);
 
-void heap_free(u8* ptr);
+void heapFree(u8* ptr);
 
 void copy(u8* dst, u8* src, u32 len);
 
diff --git a/lib/src/mem/impl.c b/lib/src/mem/impl.c
index 9d384a8..aad36d0 100644
--- a/lib/src/mem/impl.c
+++ b/lib/src/mem/impl.c
@@ -8,17 +8,17 @@
 
 #define HEAP_API_GLOBAL_FLAGS HEAP_ZERO_MEMORY | HEAP_GENERATE_EXCEPTIONS
 
-void heap_alloc(u32 len, u8** ptr) {
+void heapAlloc(u32 len, u8** ptr) {
     HANDLE heap = GetProcessHeap();
     *ptr = HeapAlloc(heap, HEAP_API_GLOBAL_FLAGS, len);
 }
 
-void heap_realloc(u32 len, u8** ptr) {
+void heapRealloc(u32 len, u8** ptr) {
     HANDLE heap = GetProcessHeap();
     *ptr = HeapReAlloc(heap, HEAP_API_GLOBAL_FLAGS, *ptr, len);
 }
 
-void heap_free(u8* ptr) {
+void heapFree(u8* ptr) {
     HANDLE heap = GetProcessHeap();
     HeapFree(heap, ptr);
 }
@@ -27,15 +27,15 @@ void heap_free(u8* ptr) {
 
 #include <malloc.h>
 
-void heap_alloc(u32 len, u8** ptr) {
+void heapAlloc(u32 len, u8** ptr) {
     *ptr = malloc(len);
 }
 
-void heap_realloc(u32 len, u8** ptr) {
+void heapRealloc(u32 len, u8** ptr) {
     *ptr = realloc(*ptr, len);
 }
 
-void heap_free(u8* ptr) {
+void heapFree(u8* ptr) {
     free(ptr);
 }
 
diff --git a/src/llvm/llvm-ir/types.c b/src/llvm/llvm-ir/types.c
index c64ed6e..e791bc5 100644
--- a/src/llvm/llvm-ir/types.c
+++ b/src/llvm/llvm-ir/types.c
@@ -42,7 +42,7 @@ static BackendError get_const_composite_value(CompositeType composite,
 
 BackendError impl_reference_const(LLVMBackendCompileUnit* unit, TypeValue* value, LLVMValueRef* llvm_value) {
     BackendError err = SUCCESS;
-    if (value->type->kind == TypeKindReference && compareTypes(value->type, (Type*) &StringLiteralType)) {
+    if (compareTypes(value->type, (Type*) &StringLiteralType)) {
         // is string literal
         LLVMValueRef string_value = LLVMConstString(value->value, strlen(value->value), false);
 
diff --git a/tests/stdlib/build.toml b/tests/stdlib/build.toml
new file mode 100644
index 0000000..456b20e
--- /dev/null
+++ b/tests/stdlib/build.toml
@@ -0,0 +1,15 @@
+[project]
+name = "Stdlib tests"
+version = "0.1.0"
+description = "Test applications for the GSC standard library."
+license = "GPL-2.0"
+authors = [ "Sven Vogel <sven.vogel123@web.de>" ]
+
+[target.echo]
+link-paths = [ "../../bin/std" ]
+import-paths = [ "../../lib/src" ]
+root = "src/echo.gsc"
+mode = "application"
+output = "bin"
+archive = "archive"
+print_ir = true
diff --git a/tests/stdlib/src/echo.gsc b/tests/stdlib/src/echo.gsc
new file mode 100644
index 0000000..8b0095b
--- /dev/null
+++ b/tests/stdlib/src/echo.gsc
@@ -0,0 +1,27 @@
+
+import "std"
+
+cstr: EOL = "\n"
+
+fun main(out u32: e) {
+
+    handle: stdin = nullHandle
+    getStdinHandle(stdin)
+
+    handle: stdout = nullHandle
+    getStdoutHandle(stdout)
+
+    ref u8: buffer = 0 as ref u8
+    heapAlloc(256)(buffer)
+
+    u32: bytesRead = 0 as u32
+    readBytes(stdin, buffer, 8)(bytesRead)
+
+    u32: bytesWritten = 0 as u32
+    writeBytes(stdout, buffer, bytesRead)(bytesWritten)
+    writeBytes(stdout, EOL, 1)(bytesWritten)
+
+    heapFree(buffer)
+
+    e = 0 as u32
+}