diff --git a/stdlib/src/compress.rs b/stdlib/src/compress.rs
index d1daf83b..928fa1a6 100644
--- a/stdlib/src/compress.rs
+++ b/stdlib/src/compress.rs
@@ -5,9 +5,22 @@ use std::io::{Read, Write};
 use std::path::Path;
 use std::rc::Rc;
 use techscript_runtime::{
-    context::Capability, error::RuntimeError, error::RuntimeErrorKind, value::RuntimeValue,
+    context::{Capability, RuntimeContext}, error::RuntimeError, error::RuntimeErrorKind, value::RuntimeValue,
 };
 
+fn check_fs_capability(ctx: &RuntimeContext) -> Result<(), RuntimeError> {
+    if !ctx.config.capabilities.contains(&Capability::FileSystem) {
+        return Err(RuntimeError::new(
+            RuntimeErrorKind::InvalidOperation(
+                "Security policy violation: FileSystem capability is denied".to_string(),
+            ),
+            None,
+            None,
+        ));
+    }
+    Ok(())
+}
+
 impl StdlibRegistry {
     pub fn register_compress(&mut self) {
         let mut exports: HashMap<String, Rc<dyn techscript_runtime::function::Callable>> =
@@ -19,16 +32,7 @@ impl StdlibRegistry {
                 name: "zip".to_string(),
                 arity: 2,
                 callback: |ctx, args| {
-                    if !ctx.config.capabilities.contains(&Capability::FileSystem) {
-                        return Err(RuntimeError::new(
-                            RuntimeErrorKind::InvalidOperation(
-                                "Security policy violation: FileSystem capability is denied"
-                                    .to_string(),
-                            ),
-                            None,
-                            None,
-                        ));
-                    }
+                    check_fs_capability(ctx)?;
                     let src_dir = args[0].try_into_string()?;
                     let archive_path = args[1].try_into_string()?;
                     zip_dir(&src_dir, &archive_path).map_err(|e| {
@@ -49,16 +53,7 @@ impl StdlibRegistry {
                 name: "unzip".to_string(),
                 arity: 2,
                 callback: |ctx, args| {
-                    if !ctx.config.capabilities.contains(&Capability::FileSystem) {
-                        return Err(RuntimeError::new(
-                            RuntimeErrorKind::InvalidOperation(
-                                "Security policy violation: FileSystem capability is denied"
-                                    .to_string(),
-                            ),
-                            None,
-                            None,
-                        ));
-                    }
+                    check_fs_capability(ctx)?;
                     let archive_path = args[0].try_into_string()?;
                     let dest_dir = args[1].try_into_string()?;
                     unzip_archive(&archive_path, &dest_dir).map_err(|e| {
@@ -79,16 +74,7 @@ impl StdlibRegistry {
                 name: "tar".to_string(),
                 arity: 2,
                 callback: |ctx, args| {
-                    if !ctx.config.capabilities.contains(&Capability::FileSystem) {
-                        return Err(RuntimeError::new(
-                            RuntimeErrorKind::InvalidOperation(
-                                "Security policy violation: FileSystem capability is denied"
-                                    .to_string(),
-                            ),
-                            None,
-                            None,
-                        ));
-                    }
+                    check_fs_capability(ctx)?;
                     let src_dir = args[0].try_into_string()?;
                     let archive_path = args[1].try_into_string()?;
                     tar_dir(&src_dir, &archive_path).map_err(|e| {
@@ -109,16 +95,7 @@ impl StdlibRegistry {
                 name: "untar".to_string(),
                 arity: 2,
                 callback: |ctx, args| {
-                    if !ctx.config.capabilities.contains(&Capability::FileSystem) {
-                        return Err(RuntimeError::new(
-                            RuntimeErrorKind::InvalidOperation(
-                                "Security policy violation: FileSystem capability is denied"
-                                    .to_string(),
-                            ),
-                            None,
-                            None,
-                        ));
-                    }
+                    check_fs_capability(ctx)?;
                     let archive_path = args[0].try_into_string()?;
                     let dest_dir = args[1].try_into_string()?;
                     untar_archive(&archive_path, &dest_dir).map_err(|e| {
@@ -139,16 +116,7 @@ impl StdlibRegistry {
                 name: "gzip".to_string(),
                 arity: 2,
                 callback: |ctx, args| {
-                    if !ctx.config.capabilities.contains(&Capability::FileSystem) {
-                        return Err(RuntimeError::new(
-                            RuntimeErrorKind::InvalidOperation(
-                                "Security policy violation: FileSystem capability is denied"
-                                    .to_string(),
-                            ),
-                            None,
-                            None,
-                        ));
-                    }
+                    check_fs_capability(ctx)?;
                     let src_file = args[0].try_into_string()?;
                     let archive_path = args[1].try_into_string()?;
                     gzip_file(&src_file, &archive_path).map_err(|e| {
@@ -169,16 +137,7 @@ impl StdlibRegistry {
                 name: "gunzip".to_string(),
                 arity: 2,
                 callback: |ctx, args| {
-                    if !ctx.config.capabilities.contains(&Capability::FileSystem) {
-                        return Err(RuntimeError::new(
-                            RuntimeErrorKind::InvalidOperation(
-                                "Security policy violation: FileSystem capability is denied"
-                                    .to_string(),
-                            ),
-                            None,
-                            None,
-                        ));
-                    }
+                    check_fs_capability(ctx)?;
                     let archive_path = args[0].try_into_string()?;
                     let dest_file = args[1].try_into_string()?;
                     gunzip_archive(&archive_path, &dest_file).map_err(|e| {
diff --git a/test_output.log b/test_output.log
deleted file mode 100644
index d8364f42..00000000
--- a/test_output.log
+++ /dev/null
@@ -1,384 +0,0 @@
- Downloading crates ...
-  Downloaded plotters-svg v0.3.7
-  Downloaded same-file v1.0.6
-  Downloaded plotters-backend v0.3.7
-  Downloaded alloca v0.4.0
-  Downloaded ciborium v0.2.2
-  Downloaded ciborium-ll v0.2.2
-  Downloaded walkdir v2.5.0
-  Downloaded tinytemplate v1.2.1
-  Downloaded page_size v0.6.0
-  Downloaded itertools v0.13.0
-  Downloaded oorandom v11.1.5
-  Downloaded criterion-plot v0.8.2
-  Downloaded ciborium-io v0.2.2
-  Downloaded criterion v0.8.2
-  Downloaded regex v1.13.1
-  Downloaded plotters v0.3.7
-  Downloaded cast v0.3.0
-  Downloaded anes v0.1.6
-   Compiling unicode-ident v1.0.24
-   Compiling cfg-if v1.0.4
-   Compiling serde_core v1.0.229
-   Compiling serde v1.0.229
-   Compiling libc v0.2.189
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-   Compiling memchr v2.8.3
-   Compiling quote v1.0.47
-   Compiling syn v3.0.3
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-   Compiling typenum v1.20.1
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-   Compiling log v0.4.33
-   Compiling simd-adler32 v0.3.10
-   Compiling crossbeam-utils v0.8.22
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-   Compiling bitflags v2.13.1
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-   Compiling itoa v1.0.18
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-   Compiling serde_derive v1.0.229
-   Compiling strum_macros v0.28.0
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-error: https://xkcd.com/2347/
- --> /home/jules/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/bincode-3.0.0/src/lib.rs:1:1
-  |
-1 | compile_error!("https://xkcd.com/2347/");
-  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: could not compile `bincode` (lib) due to 1 previous error
-warning: build failed, waiting for other jobs to finish...