diff --git a/CMakeLists.txt b/CMakeLists.txt
index fbfca89..7d93022 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.10)
-project(fun VERSION 0.38.0 LANGUAGES C)
+project(fun VERSION 0.38.1 LANGUAGES C)
 
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_C_STANDARD_REQUIRED ON)
diff --git a/cmake/Targets.cmake b/cmake/Targets.cmake
index c1db251..dbdb7da 100644
--- a/cmake/Targets.cmake
+++ b/cmake/Targets.cmake
@@ -90,6 +90,16 @@ if(FUN_WITH_TCLTK)
   target_compile_definitions(fun_core PUBLIC FUN_WITH_TCLTK=1)
 endif()
 
+# Workaround: provide a dummy rust_eh_personality to satisfy linker when using
+# no_std Rust staticlib with panic abort (some toolchains still reference it).
+# If needed, we could add a C shim here, but the Rust crate now defines
+# rust_eh_personality itself, so no extra C sources are required.
+if(FUN_WITH_RUST)
+  if(TARGET fun)
+    target_sources(fun PRIVATE ${CMAKE_SOURCE_DIR}/src/rust/eh_personality.c)
+  endif()
+endif()
+
 # Special case for libxml2 system include path if enabled
 if(FUN_WITH_XML2)
   if(EXISTS "/usr/include/libxml2")
diff --git a/examples/extra/http_server_test.fun b/examples/blocking/http_server_test.fun
similarity index 100%
rename from examples/extra/http_server_test.fun
rename to examples/blocking/http_server_test.fun
diff --git a/examples/extra/pcsc_demo.fun b/examples/extra/pcsc_demo.fun
index 850ace6..47d1572 100755
--- a/examples/extra/pcsc_demo.fun
+++ b/examples/extra/pcsc_demo.fun
@@ -33,9 +33,9 @@ if len(readers) > 0
 
   if h != 0
     // Sample APDU: SELECT MF (00 A4 00 00 02 3F 00)
-    resp = pc.transmit_hex(h, "00A40000023F00")
-    // Print hex data and SW
-    print("resp.data_hex=" + resp["data_hex"])
+    // Use the safe convenience transmitter which returns a map {data, sw1, sw2, code}
+    resp = pc.transmit("00A40000023F00")
+    print("resp.data.len=" + to_string(len(resp["data"])) + " bytes")
     print("resp.sw1=" + to_string(resp["sw1"]) + " sw2=" + to_string(resp["sw2"]) + " code=" + to_string(resp["code"]))
 
     _ = pc.disconnect(h)
diff --git a/examples/rust_hello.fun b/examples/rust_hello.fun
index 5cd23d2..e5455db 100755
--- a/examples/rust_hello.fun
+++ b/examples/rust_hello.fun
@@ -30,3 +30,7 @@
  */
 
 print(rust_hello())
+
+/* Expected output:
+Hello from Rust ops!
+*/ 
diff --git a/examples/rust_hello_args.fun b/examples/rust_hello_args.fun
new file mode 100755
index 0000000..9fd2e70
--- /dev/null
+++ b/examples/rust_hello_args.fun
@@ -0,0 +1,37 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2026-01-28
+ */
+
+/*
+ * Rust-backed opcode demo with argument: rust_hello_args(STRING)
+ *
+ * Build instructions:
+ *   - Rust integration is optional. Enable via:
+ *       cmake -S . -B build_debug -DFUN_WITH_RUST=ON
+ *   - Then build:
+ *       cmake --build build_debug --target fun
+ *
+ * Run:
+ *   build_debug/fun examples/rust_hello_args.fun
+ *
+ * Expected output (with FUN_WITH_RUST=ON):
+ *   Hello from Fun to Rust!
+ *
+ * Note:
+ *   The opcode prints from Rust and returns Nil, so there's nothing to print afterwards.
+ */
+
+rust_hello_args("Hello from Fun to Rust!")
+
+/* Expected output:
+Hello from Fun to Rust!
+*/ 
diff --git a/lib/io/pcsc.fun b/lib/io/pcsc.fun
index feb9263..14cc764 100644
--- a/lib/io/pcsc.fun
+++ b/lib/io/pcsc.fun
@@ -17,11 +17,9 @@
 
 include <hex.fun>
 
-/*
+// Unified PCSC class API
 class PCSC()
-  // ---- hex helpers moved to lib/hex.fun ----
-
-  // ---- PCSC wrappers ----
+  // ---- Context management ----
   fun establish(this)
     // returns ctx id (>0) or 0
     return pcsc_establish()
@@ -36,6 +34,16 @@ class PCSC()
       return []
     return readers
 
+  // Convenience: get readers without managing ctx externally
+  fun get_readers(this)
+    ctx = pcsc_establish()
+    readers = pcsc_list_readers(ctx)
+    _ = pcsc_release(ctx)
+    if readers == nil
+      return []
+    return readers
+
+  // ---- Connection management ----
   fun connect(this, ctx, reader_name)
     // returns handle id (>0) or 0
     return pcsc_connect(ctx, to_string(reader_name))
@@ -44,6 +52,7 @@ class PCSC()
     // returns 1 on success or 0
     return pcsc_disconnect(handle)
 
+  // ---- Transmit helpers ----
   // Transmit raw APDU bytes (array of numbers 0..255). Returns map {"data":[], "sw1":n, "sw2":n, "code":n}
   fun transmit_bytes(this, handle, bytes)
     res = pcsc_transmit(handle, bytes)
@@ -77,22 +86,12 @@ class PCSC()
     m["sw2"] = res["sw2"]
     m["code"] = res["code"]
     return m
-*/
 
-// This class is in a very early stage of development. 
-class PCSC()
-  fun get_readers(this)
-    ctx = pcsc_establish()
-    readers = pcsc_list_readers(ctx)
-    _ = pcsc_release(ctx)
-    return readers
-
-  // Transmit a raw hex APDU to the first available reader and print the result map
+  // Convenience: Transmit a raw hex APDU to the first available reader and return the result map
   fun transmit(this, hex_apdu)
     ctx = pcsc_establish()
     readers = pcsc_list_readers(ctx)
     if (readers == nil)
-      print([])
       _ = pcsc_release(ctx)
       // return a default result map instead of 0, so callers can index fields safely
       m = {}
@@ -102,7 +101,6 @@ class PCSC()
       m["code"] = -2
       return m
     if (len(readers) == 0)
-      print([])
       _ = pcsc_release(ctx)
       m = {}
       m["data"] = []
@@ -110,50 +108,19 @@ class PCSC()
       m["sw2"] = -1
       m["code"] = -2
       return m
-    // Actually selecting the second reader hardcoded.
+    // Select the second reader (index 1) as previously used in examples
     handle = pcsc_connect(ctx, readers[1])
-    apdu = this.hex_to_bytes(hex_apdu)
-    res = pcsc_transmit(handle, apdu)
+    apdu_bytes = hex_to_bytes(hex_apdu)
+    res = pcsc_transmit(handle, apdu_bytes)
     _ = pcsc_disconnect(handle)
     _ = pcsc_release(ctx)
+    if res == nil
+      m = {}
+      m["data"] = []
+      m["sw1"] = -1
+      m["sw2"] = -1
+      m["code"] = -2
+      return m
+    if res["data"] == nil
+      res["data"] = []
     return res
-
-  fun hex_digit(this, ch)
-    m = {}
-    m["0"] = 0
-    m["1"] = 1
-    m["2"] = 2
-    m["3"] = 3
-    m["4"] = 4
-    m["5"] = 5
-    m["6"] = 6
-    m["7"] = 7
-    m["8"] = 8
-    m["9"] = 9
-    m["a"] = 10
-    m["A"] = 10
-    m["b"] = 11
-    m["B"] = 11
-    m["c"] = 12
-    m["C"] = 12
-    m["d"] = 13
-    m["D"] = 13
-    m["e"] = 14
-    m["E"] = 14
-    m["f"] = 15
-    m["F"] = 15
-    v = m[ch]
-    if v == nil
-      return 0
-    return v
-
-  fun hex_to_bytes(this, hex)
-    s = to_string(hex)
-    out = []
-    number i = 0
-    number n = len(s)
-    while i + 1 < n
-      number b = this.hex_digit(substr(s, i, 1)) * 16 + this.hex_digit(substr(s, i + 1, 1))
-      push(out, b)
-      i = i + 2
-    return out
diff --git a/make b/make
index b0d587a..18c5969 100755
--- a/make
+++ b/make
@@ -88,6 +88,27 @@ elif [ "$target" = "repl" ]; then
     && cmake -S . -B build \
       -DFUN_WITH_REPL=ON \
     && cmake --build build --target fun
+elif [ "$target" = "rust_all" ]; then
+  rm -rf build && rm -rf src/rust/target \
+    && cmake -S . -B build \
+      -DFUN_WITH_PCSC=ON \
+      -DFUN_WITH_REPL=ON \
+      -DFUN_WITH_LIBSQL=ON \
+      -DFUN_WITH_SQLITE=ON \
+      -DFUN_WITH_CURL=ON \
+      -DFUN_WITH_PCRE2=ON \
+      -DFUN_WITH_XML2=ON \
+      -DFUN_WITH_JSON=ON \
+      -DFUN_WITH_TCLTK=ON \
+      -DFUN_WITH_INI=ON \
+      -DFUN_WITH_RUST=ON \
+      -DFUN_DEBUG=OFF \
+    && cmake --build build --target fun
+elif [ "$target" = "rust_minimal" ]; then
+  rm -rf build && rm -rf src/rust/target \
+    && cmake -S . -B build \
+      -DFUN_WITH_RUST=ON \
+    && cmake --build build --target fun
 else
   echo "Build target $target not found... aborting!";
   echo "Available targets:";
@@ -100,5 +121,7 @@ else
   echo " - minimal";
   echo " - musl";
   echo " - repl";
+  echo " - rust_all";
+  echo " - rust_minimal";
 fi
 
diff --git a/src/bytecode.c b/src/bytecode.c
index 58b62a8..82d8ca1 100644
--- a/src/bytecode.c
+++ b/src/bytecode.c
@@ -207,6 +207,7 @@ static const char *opcode_name(OpCode op) {
         case OP_FMIN: return "FMIN";
         case OP_FMAX: return "FMAX";
         case OP_RUST_HELLO: return "RUST_HELLO";
+        case OP_RUST_HELLO_ARGS: return "RUST_HELLO_ARGS";
         default: return "???";
     }
 }
diff --git a/src/bytecode.h b/src/bytecode.h
index 0cb4908..81c12c1 100644
--- a/src/bytecode.h
+++ b/src/bytecode.h
@@ -265,6 +265,7 @@ typedef enum {
 
     // Rust FFI demo opcode(s)
     OP_RUST_HELLO,        // pushes string returned from Rust (hello world)
+    OP_RUST_HELLO_ARGS,   // pops message string; prints it via Rust; pushes Nil
 
     /* Notcurses TUI (optional) */
     OP_NC_INIT,           // initializes Notcurses; returns 1 on success, 0 on failure
diff --git a/src/parser.c b/src/parser.c
index 78da293..bef13c9 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -793,6 +793,14 @@ static int emit_primary(Bytecode *bc, const char *src, size_t len, size_t *pos)
                 free(name);
                 return 1;
             }
+            if (strcmp(name, "rust_hello_args") == 0) {
+                (*pos)++; /* '(' */
+                if (!emit_expression(bc, src, len, pos)) { parser_fail(*pos, "rust_hello_args expects (message:string)"); free(name); return 0; }
+                if (!consume_char(src, len, pos, ')')) { parser_fail(*pos, "Expected ')' after rust_hello_args arg"); free(name); return 0; }
+                bytecode_add_instruction(bc, OP_RUST_HELLO_ARGS, 0);
+                free(name);
+                return 1;
+            }
             if (strcmp(name, "os_list_dir") == 0) {
                 (*pos)++; /* '(' */
                 if (!emit_expression(bc, src, len, pos)) { parser_fail(*pos, "os_list_dir expects (path)"); free(name); return 0; }
diff --git a/src/rust/Cargo.toml b/src/rust/Cargo.toml
index a6c7500..1080d9f 100644
--- a/src/rust/Cargo.toml
+++ b/src/rust/Cargo.toml
@@ -6,6 +6,9 @@ edition = "2021"
 [lib]
 crate-type = ["staticlib"]
 
+[profile.dev]
+panic = "abort"
+
 [profile.release]
 panic = "abort"
 # Optimize for minimal size
diff --git a/src/rust/eh_personality.c b/src/rust/eh_personality.c
new file mode 100644
index 0000000..666aec0
--- /dev/null
+++ b/src/rust/eh_personality.c
@@ -0,0 +1,2 @@
+/* Workaround for linking Rust staticlib in no_std/abort mode on some toolchains */
+void rust_eh_personality(void) {}
diff --git a/src/rust/src/lib.rs b/src/rust/src/lib.rs
index 12121ed..115785b 100644
--- a/src/rust/src/lib.rs
+++ b/src/rust/src/lib.rs
@@ -11,8 +11,8 @@
 
 #![no_std]
 
-#[repr(C)]
-pub struct Vm;
+// Use an FFI-safe opaque handle for the VM pointer
+pub type Vm = core::ffi::c_void;
 
 extern "C" {
     fn vm_pop_i64(vm: *mut Vm) -> i64;
@@ -37,6 +37,23 @@ pub extern "C" fn fun_rust_get_string() -> *const core::ffi::c_char {
     b"Hello from Rust ops!\0".as_ptr() as *const _
 }
 
+// Print a C string via libc printf to stdout (acceptable under no_std via extern)
+#[no_mangle]
+pub extern "C" fn fun_rust_print_string(msg: *const core::ffi::c_char) -> i32 {
+    unsafe {
+        extern "C" {
+            fn printf(fmt: *const core::ffi::c_char, ...) -> i32;
+        }
+        let fmt = b"%s\n\0".as_ptr() as *const core::ffi::c_char;
+        printf(fmt, msg);
+    }
+    0
+}
+
+// Provide personality symbol to satisfy some linkers in no_std builds
+#[no_mangle]
+pub extern "C" fn rust_eh_personality() {}
+
 // Minimal panic handler for no_std; abort behavior requested via Cargo profile
 #[panic_handler]
 fn panic(_info: &core::panic::PanicInfo) -> ! {
diff --git a/src/vm.h b/src/vm.h
index 0e1d528..e746a96 100644
--- a/src/vm.h
+++ b/src/vm.h
@@ -56,7 +56,7 @@ static const char *opcode_names[] = {
     "TRY_PUSH","TRY_POP","THROW",
     "FMIN","FMAX",
     /* Rust FFI demo */
-    "RUST_HELLO",
+    "RUST_HELLO","RUST_HELLO_ARGS",
     /* Notcurses TUI (optional) */
     "NC_INIT","NC_SHUTDOWN","NC_CLEAR","NC_DRAW_TEXT","NC_GETCH"
 };
@@ -157,5 +157,7 @@ int fun_op_radd(VM *vm);
 
 /* Example Rust function returning a demo C string (null-terminated). */
 const char *fun_rust_get_string(void);
+/* Rust function that prints a passed C string, returns 0 on success. */
+int fun_rust_print_string(const char *msg);
 
 #endif
diff --git a/src/vm/rust/hello.c b/src/vm/rust/hello.c
index 709d8c6..6878c46 100644
--- a/src/vm/rust/hello.c
+++ b/src/vm/rust/hello.c
@@ -25,3 +25,29 @@ case OP_RUST_HELLO: {
 #endif
     break;
 }
+
+/*
+ * Rust FFI demo opcode with argument: OP_RUST_HELLO_ARGS
+ * Pops a string from the stack and asks Rust to print it. Pushes Nil.
+ */
+case OP_RUST_HELLO_ARGS: {
+#ifdef FUN_WITH_RUST
+    Value vmsg = pop_value(vm);
+    char *msg = value_to_string_alloc(&vmsg);
+    free_value(vmsg);
+    if (msg) {
+        fun_rust_print_string(msg);
+        free(msg);
+    } else {
+        fun_rust_print_string("");
+    }
+    push_value(vm, make_nil());
+#else
+    /* Still pop and free the arg to keep stack sane */
+    Value vmsg = pop_value(vm);
+    free_value(vmsg);
+    vm_raise_error(vm, "RUST_HELLO_ARGS requires FUN_WITH_RUST=ON at build time");
+    push_value(vm, make_nil());
+#endif
+    break;
+}