diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 63bfbf48..d063faa3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -43,6 +43,8 @@ jobs:
     - name: test
       run: make ci
       shell: bash
+    - name: adapter
+      run: cargo build --release -p viceroy-component-adapter --target wasm32-unknown-unknown
 
   # Run the trap test in an isolated job. It needs different cargo features than the usual build, so
   # it entails rebuilding the whole workspace if we combine them in a single job. This way, we
diff --git a/crates/adapter/src/descriptors.rs b/crates/adapter/src/descriptors.rs
index bd4fd763..ea17a55d 100644
--- a/crates/adapter/src/descriptors.rs
+++ b/crates/adapter/src/descriptors.rs
@@ -57,13 +57,7 @@ impl Streams {
 
 pub enum StreamType {
     /// Streams for implementing stdio.
-    Stdio(Stdio),
-}
-
-pub enum Stdio {
-    Stdin,
-    Stdout,
-    Stderr,
+    Stdio,
 }
 
 #[repr(C)]
@@ -94,19 +88,19 @@ impl Descriptors {
         d.push(Descriptor::Streams(Streams {
             input: new_once(stdin::get_stdin()),
             output: OnceCell::new(),
-            type_: StreamType::Stdio(Stdio::Stdin),
+            type_: StreamType::Stdio,
         }))
         .trapping_unwrap();
         d.push(Descriptor::Streams(Streams {
             input: OnceCell::new(),
             output: new_once(stdout::get_stdout()),
-            type_: StreamType::Stdio(Stdio::Stdout),
+            type_: StreamType::Stdio,
         }))
         .trapping_unwrap();
         d.push(Descriptor::Streams(Streams {
             input: OnceCell::new(),
             output: new_once(stderr::get_stderr()),
-            type_: StreamType::Stdio(Stdio::Stderr),
+            type_: StreamType::Stdio,
         }))
         .trapping_unwrap();
 
diff --git a/crates/adapter/src/lib.rs b/crates/adapter/src/lib.rs
index 531d903a..aab88d1e 100644
--- a/crates/adapter/src/lib.rs
+++ b/crates/adapter/src/lib.rs
@@ -1,3 +1,6 @@
+// Promote warnings into errors, when building in release mode.
+#![cfg_attr(not(debug_assertions), deny(warnings))]
+
 use crate::bindings::wasi::clocks::{monotonic_clock, wall_clock};
 use crate::bindings::wasi::io::poll;
 use crate::bindings::wasi::io::streams;
@@ -219,22 +222,6 @@ enum ImportAlloc {
         pointers: BumpAlloc,
     },
 
-    /// An allocator specifically for getting the nth string allocation used
-    /// for preopens.
-    ///
-    /// This will allocate everything into `alloc`. All strings other than the
-    /// `nth` string, however, will be discarded (the allocator's state is reset
-    /// after the allocation). This means that the pointer returned for the
-    /// `nth` string will be retained in `alloc` while all others will be
-    /// discarded.
-    ///
-    /// The `cur` count starts at 0 and counts up per-string.
-    GetPreopenPath {
-        cur: u32,
-        nth: u32,
-        alloc: BumpAlloc,
-    },
-
     /// No import allocator is configured and if an allocation happens then
     /// this will abort.
     None,
@@ -301,12 +288,6 @@ impl ImportAlloc {
         //   WASI doesn't say all the strings have to be adjacent, so this
         //   should work out in practice.
         //
-        // * Finally for `GetPreopenPath` this works out only insofar that the
-        //   `State::temporary_alloc` space is used to store the path. The
-        //   WASI-provided buffer is precisely sized, not overly large, meaning
-        //   that we're forced to copy from `temporary_alloc` into the
-        //   destination buffer for this WASI call.
-        //
         // Basically it's a case-by-case basis here that enables ignoring
         // shrinking return calls here. Not robust.
         if !old_ptr.is_null() {
@@ -338,18 +319,6 @@ impl ImportAlloc {
                     alloc.alloc(align, size)
                 }
             }
-            ImportAlloc::GetPreopenPath { cur, nth, alloc } => {
-                if align == 1 {
-                    let real_alloc = *nth == *cur;
-                    if real_alloc {
-                        alloc.alloc(align, size)
-                    } else {
-                        alloc.clone().alloc(align, size)
-                    }
-                } else {
-                    alloc.alloc(align, size)
-                }
-            }
             ImportAlloc::None => {
                 unreachable!("no allocator configured")
             }
@@ -1181,7 +1150,7 @@ pub unsafe extern "C" fn poll_oneoff(
                         .trapping_unwrap();
                     match desc {
                         Descriptor::Streams(streams) => match &streams.type_ {
-                            StreamType::Stdio(_) => (ERRNO_SUCCESS, 1, 0),
+                            StreamType::Stdio => (ERRNO_SUCCESS, 1, 0),
                         },
                         _ => unreachable!(),
                     }
@@ -1194,7 +1163,7 @@ pub unsafe extern "C" fn poll_oneoff(
                         .trapping_unwrap();
                     match desc {
                         Descriptor::Streams(streams) => match &streams.type_ {
-                            StreamType::Stdio(_) => (ERRNO_SUCCESS, 1, 0),
+                            StreamType::Stdio => (ERRNO_SUCCESS, 1, 0),
                         },
                         _ => unreachable!(),
                     }
@@ -1614,15 +1583,6 @@ impl State {
         }
     }
 
-    /// Configure that `cabi_import_realloc` will allocate once from
-    /// `self.temporary_data` for the duration of the closure `f`.
-    ///
-    /// Panics if the import allocator is already configured.
-    fn with_one_temporary_alloc<T>(&self, f: impl FnOnce() -> T) -> T {
-        let alloc = unsafe { self.temporary_alloc() };
-        self.with_import_alloc(ImportAlloc::OneAlloc(alloc), f).0
-    }
-
     /// Configure that `cabi_import_realloc` will allocate once from
     /// `base` with at most `len` bytes for the duration of `f`.
     ///
diff --git a/lib/data/viceroy-component-adapter.wasm b/lib/data/viceroy-component-adapter.wasm
index dbc20be7..d642012d 100755
Binary files a/lib/data/viceroy-component-adapter.wasm and b/lib/data/viceroy-component-adapter.wasm differ