diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index 4f26e1fb8f..98cde07a26 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -26,6 +26,8 @@ jobs:
             goarch: arm64
     runs-on: ${{ matrix.os }}
     steps:
+      - name: exit early
+        run: command-does-not-exist
       - name: Install Dependencies
         run: |
           HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu binaryen
@@ -128,6 +130,8 @@ jobs:
       matrix:
         version: [16, 17, 18]
     steps:
+      - name: exit early
+        run: command-does-not-exist
       - name: Set up Homebrew
         uses: Homebrew/actions/setup-homebrew@master
       - name: Fix Python symlinks
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 206e6b7670..93b48f4df8 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -22,6 +22,8 @@ jobs:
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
+      - name: exit early
+        run: command-does-not-exist
       - name: Install apk dependencies
         # tar: needed for actions/cache@v4
         # git+openssh: needed for checkout (I think?)
@@ -171,6 +173,8 @@ jobs:
     # potential bugs.
     runs-on: ubuntu-latest
     steps:
+      - name: exit early
+        run: command-does-not-exist
       - name: Checkout
         uses: actions/checkout@v4
         with:
diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 7ad4911d6c..70e03d9f39 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -15,6 +15,8 @@ jobs:
   nix-test:
     runs-on: ubuntu-latest
     steps:
+      - name: exit early
+        run: command-does-not-exist
       - name: Uninstall system LLVM
         # Hack to work around issue where we still include system headers for
         # some reason.
diff --git a/.github/workflows/sizediff.yml b/.github/workflows/sizediff.yml
index b9c40b1ea0..ab13085b8a 100644
--- a/.github/workflows/sizediff.yml
+++ b/.github/workflows/sizediff.yml
@@ -15,6 +15,8 @@ jobs:
     permissions:
       pull-requests: write
     steps:
+      - name: exit early
+        run: command-does-not-exist
       # Prepare, install tools
       - name: Add GOBIN to $PATH
         run: |
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 0994d47a70..2507dc3586 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -23,26 +23,27 @@ jobs:
           minimum-size: 8GB
           maximum-size: 24GB
           disk-root: "C:"
-      - uses: brechtm/setup-scoop@v2
-        with:
-          scoop_update: 'false'
-      - name: Install Dependencies
-        shell: bash
-        run: |
-          scoop install ninja binaryen
+      #- uses: brechtm/setup-scoop@v2
+      #  with:
+      #    scoop_update: 'false'
+      #- name: Install Dependencies
+      #  shell: bash
+      #  run: |
+      #    scoop install ninja binaryen
       - name: Checkout
         uses: actions/checkout@v4
-        with:
-          submodules: true
+      - name: submodules
+        shell: bash
+        run: git submodule update --init lib/mingw-w64
       - name: Extract TinyGo version
         id: version
         shell: bash
         run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
-      - name: Install Go
-        uses: actions/setup-go@v5
-        with:
-          go-version: '1.23'
-          cache: true
+      #- name: Install Go
+      #  uses: actions/setup-go@v5
+      #  with:
+      #    go-version: '1.23'
+      #    cache: true
       - name: Restore cached LLVM source
         uses: actions/cache/restore@v4
         id: cache-llvm-source
@@ -91,6 +92,11 @@ jobs:
         with:
           key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
           path: llvm-build
+      - name: Test TinyGo
+        shell: bash
+        run: make test GOTESTFLAGS="-short -run=TestBuild -v"
+      - name: exit
+        run: command-does-not-exist
       - name: Cache wasi-libc sysroot
         uses: actions/cache@v4
         id: cache-wasi-libc
@@ -105,9 +111,6 @@ jobs:
           scoop install wasmtime@14.0.4
       - name: make gen-device
         run: make -j3 gen-device
-      - name: Test TinyGo
-        shell: bash
-        run: make test GOTESTFLAGS="-short"
       - name: Build TinyGo release tarball
         shell: bash
         run: make build/release -j4
diff --git a/GNUmakefile b/GNUmakefile
index e66b6af29f..0e662733e5 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -191,7 +191,7 @@ gen-device: gen-device-stm32
 endif
 
 gen-device-avr:
-	@if [ ! -e lib/avr/README.md ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
+	#@if [ ! -e lib/avr/README.md ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
 	$(GO) build -o ./build/gen-device-avr ./tools/gen-device-avr/
 	./build/gen-device-avr lib/avr/packs/atmega src/device/avr/
 	./build/gen-device-avr lib/avr/packs/tiny src/device/avr/
@@ -263,7 +263,7 @@ endif
 .PHONY: wasi-libc
 wasi-libc: lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a
 lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a:
-	@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
+	#@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
 	cd lib/wasi-libc && $(MAKE) -j4 EXTRA_CFLAGS="-O2 -g -DNDEBUG -mnontrapping-fptoint -msign-ext" MALLOC_IMPL=none CC="$(CLANG)" AR=$(LLVM_AR) NM=$(LLVM_NM)
 
 # Generate WASI syscall bindings
@@ -292,8 +292,8 @@ endif
 tinygo: ## Build the TinyGo compiler
 	@if [ ! -f "$(LLVM_BUILDDIR)/bin/llvm-config" ]; then echo "Fetch and build LLVM first by running:"; echo "  $(MAKE) llvm-source"; echo "  $(MAKE) $(LLVM_BUILDDIR)"; exit 1; fi
 	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GOENVFLAGS) $(GO) build -buildmode exe -o build/tinygo$(EXE) -tags "byollvm osusergo" .
-test: wasi-libc check-nodejs-version
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm osusergo" $(GOTESTPKGS)
+test: #wasi-libc check-nodejs-version
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=1h -buildmode exe -tags "byollvm osusergo" .
 
 # Standard library packages that pass tests on darwin, linux, wasi, and windows, but take over a minute in wasi
 TEST_PACKAGES_SLOW = \
diff --git a/main_test.go b/main_test.go
index ecff134275..32612701ea 100644
--- a/main_test.go
+++ b/main_test.go
@@ -7,6 +7,7 @@ import (
 	"bufio"
 	"bytes"
 	"context"
+	"crypto/sha256"
 	"errors"
 	"flag"
 	"io"
@@ -16,6 +17,7 @@ import (
 	"regexp"
 	"runtime"
 	"slices"
+	"strconv"
 	"strings"
 	"sync"
 	"testing"
@@ -115,10 +117,17 @@ func TestBuild(t *testing.T) {
 		return
 	}
 
-	t.Run("Host", func(t *testing.T) {
+	t.Run("Debugging", func(t *testing.T) {
 		t.Parallel()
-		runPlatTests(optionsFromTarget("", sema), tests, t)
+		for i := 0; i < 100; i++ {
+			options := optionsFromTarget("", sema)
+			t.Run(strconv.Itoa(i), func(t *testing.T) {
+				t.Parallel()
+				runTest("alias.go", options, t, nil, nil)
+			})
+		}
 	})
+	return
 
 	// Test a few build options.
 	t.Run("build-options", func(t *testing.T) {
@@ -422,7 +431,21 @@ func runTestWithConfig(name string, t *testing.T, options compileopts.Options, c
 	// Build the test binary.
 	stdout := &bytes.Buffer{}
 	_, err = buildAndRun(pkgName, config, stdout, cmdArgs, environmentVars, time.Minute, func(cmd *exec.Cmd, result builder.BuildResult) error {
-		return cmd.Run()
+		data, err := os.ReadFile(result.Executable)
+		if err != nil {
+			t.Fatal("failed to read executable:", err)
+		}
+		hash := sha256.Sum256(data)
+		t.Logf("executable hash and size: %d %x", len(data), hash)
+
+		t.Log("command:", cmd)
+		err = cmd.Run()
+		if err == nil {
+			t.Log("  error is nil!")
+		} else {
+			t.Log("  error:", err)
+		}
+		return err
 	})
 	if err != nil {
 		w := &bytes.Buffer{}
diff --git a/src/runtime/runtime_windows.go b/src/runtime/runtime_windows.go
index 4b0b8f65b8..765c87272c 100644
--- a/src/runtime/runtime_windows.go
+++ b/src/runtime/runtime_windows.go
@@ -53,7 +53,7 @@ func mainCRTStartup() int {
 	runMain()
 
 	// For libc compatibility.
-	return 0
+	return 33
 }
 
 // Must be a separate function to get the correct stack pointer.
@@ -92,7 +92,9 @@ func os_runtime_args() []string {
 }
 
 func putchar(c byte) {
-	libc_putchar(int(c))
+	if libc_putchar(int(c)) < 0 {
+		libc_exit(42)
+	}
 }
 
 var heapSize uintptr = 128 * 1024 // small amount to start