diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b4d780782..0575e016c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -146,11 +146,11 @@ jobs:
       - name: Optimized Core library tests
         run: ./odin test tests/core/speed.odin -o:speed -file -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true
       - name: Wycheproof tests
-        run: ./odin test tests/core/crypto/wycheproof -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -o:speed
+        run: ./odin test tests/core/crypto/wycheproof -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
       - name: Noise Protocol Framework tests
-        run: ./odin test tests/core/crypto/noise -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -o:speed
+        run: ./odin test tests/core/crypto/noise -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
       - name: X.509 limbo tests
-        run: ./odin test tests/core/crypto/x509_limbo -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -o:speed
+        run: ./odin test tests/core/crypto/x509_limbo -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
       - name: Vendor library tests
         run: ./odin test tests/vendor -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true -sanitize:address
         if: matrix.os != 'macos-latest'
@@ -255,17 +255,17 @@ jobs:
         shell: cmd
         run: |
           call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
-          odin test tests/core/crypto/wycheproof -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -o:speed
+          odin test tests/core/crypto/wycheproof -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
       - name: Noise Protocol Framework tests
         shell: cmd
         run: |
           call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
-          odin test tests/core/crypto/noise -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -o:speed
+          odin test tests/core/crypto/noise -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
       - name: X.509 limbo tests
         shell: cmd
         run: |
           call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
-          odin test tests/core/crypto/x509_limbo -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -o:speed
+          odin test tests/core/crypto/x509_limbo -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
       - name: Vendor library tests
         shell: cmd
         run: |
diff --git a/.gitignore b/.gitignore
index 81e2bb7ff..62e36469d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -308,10 +308,9 @@ build.sh
 # RAD debugger project file
 *.raddbg
 *.rdi
-tests/issues/build/*
-tests/abi/build/*
-tests/abi/build-cross/*
-tests/debug_info/build/*
+
+# NOTE: The /tests/** directories have their own .gitignore files
+
 misc/featuregen/featuregen
 
 # Clangd stuff
diff --git a/run_tests.bat b/run_tests.bat
new file mode 100644
index 000000000..e383e811e
--- /dev/null
+++ b/run_tests.bat
@@ -0,0 +1,123 @@
+@rem This file runs most of the tests that the CI would run.
+@rem When the "slim" argument is provided, it omits time-intensive optimized core library tests and Wycheproof tests.
+
+setlocal EnableDelayedExpansion
+
+@echo off
+
+set SLIM=
+
+for %%A in (%*) do (
+	if "%%A"=="slim" (
+		set SLIM=1
+	) else if "%%A"=="no-clang" (
+		set ODIN_TESTS_NO_CLANG=1
+	) else (
+		echo Unrecognized argument: %%A
+		exit /b
+	)
+)
+
+rem Check if clang is present
+if not defined ODIN_TESTS_NO_CLANG (
+	clang --version
+	if !ERRORLEVEL! neq 0 (
+		echo ERROR: clang is not present. Some tests require this.
+		echo Note: You can try using msvc instead by specifying the "no-clang" argument, or setting ODIN_TESTS_NO_CLANG=1
+		echo       However, some ABI tests will be skipped.
+		exit /b
+	)
+)
+
+@echo on
+
+@rem Check examples/all
+@pushd .
+.\odin check examples\all -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do || exit /b
+@popd
+
+@rem Check examples/all/sdl3
+@pushd .
+.\odin check examples\all\sdl3 -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -no-entry-point || exit /b
+@popd
+
+@rem Internals tests
+@pushd tests\internal
+..\..\odin test . -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true -sanitize:address || exit /b
+@popd
+
+@rem Normal Core library tests
+@pushd tests\core
+..\..\odin test normal.odin -file -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true -sanitize:address || exit /b
+@popd
+
+@rem Vendor library tests
+@pushd .
+cd tests\vendor
+mkdir build
+pushd build
+copy ..\..\..\vendor\lua\5.4\windows\*.dll .
+..\..\..\odin test ..\ -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true -sanitize:address || exit /b
+popd
+rmdir /S /Q build
+@popd
+
+@rem Check issues
+@pushd .
+cd tests\issues
+call run.bat || exit /b
+@popd
+
+@rem The ABI tests can be disabled here because they require clang at the moment.
+@rem   TODO: Maybe try to make them work with msvc as well?
+if not defined ODIN_TESTS_NO_CLANG (
+
+	@rem Run ABI tests
+	@pushd .
+	cd tests\abi
+	set ABI_CFLAGS=
+	call run.bat || exit /b
+	set ABI_CFLAGS=-O2
+	call run.bat -o:speed || exit /b
+	@popd
+
+)
+
+@rem More extensive tests (non-slim):
+
+if not defined SLIM (
+
+	@echo Running extended tests...
+
+	@rem Optimized Core library tests
+	@pushd tests\core
+	..\..\odin test speed.odin -o:speed -file -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true || exit /b
+	@popd
+
+	@rem Wycheproof tests
+	@pushd tests\core
+	..\..\odin test crypto/wycheproof -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed || exit /b
+	@popd
+
+	@rem Noise Protocol Framework tests
+	@pushd tests\core
+	..\..\odin test crypto/noise -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed || exit /b
+	@popd
+
+	@rem X.509 limbo tests
+	@pushd tests\core
+	..\..\odin test crypto/x509_limbo -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed || exit /b
+	@popd
+
+	@echo SUCCESS:  Extended tests have been executed successfully.
+	@echo           Note: You can call  "run_tests slim"  to omit some of the slower tests.
+
+) else (
+
+	@echo SUCCESS:  Slim tests have been executed successfully.
+
+)
+
+if defined ODIN_TESTS_NO_CLANG (
+	@echo WARNING:  ODIN_TESTS_NO_CLANG specified - ABI tests have been skipped.
+)
diff --git a/run_tests.sh b/run_tests.sh
new file mode 100644
index 000000000..648cc34b2
--- /dev/null
+++ b/run_tests.sh
@@ -0,0 +1,121 @@
+#!/usr/bin/env bash
+set -eu
+
+# This file runs most of the tests that the CI would run.
+# It omits time-intensive optimized core library tests and Wycheproof tests.
+
+here=$(cd "$(dirname "$0")" && pwd)
+: "${ODIN:=$here/odin}"
+
+SLIM=
+for arg in "$@"; do
+	case "$arg" in
+		slim)
+			SLIM=1
+			;;
+		no-clang)
+			export ODIN_TESTS_NO_CLANG=1
+			;;
+		*)
+			echo "Unrecognized argument: $arg"
+			exit 1
+			;;
+	esac
+done
+
+if [[ -z "${ODIN_TESTS_NO_CLANG:-}" ]]; then
+	if ! clang --version >/dev/null 2>&1; then
+		echo "ERROR: clang is not present. Some tests require this."
+		echo "Note: You can disable tests that require clang by specifying the \"no-clang\" argument, or setting ODIN_TESTS_NO_CLANG=1"
+		# TODO: Can we figure out how to make everything work with gcc as well when ODIN_TESTS_NO_CLANG is set?
+		exit 1
+	fi
+fi
+
+# Check examples/all
+"$ODIN" check "$here/examples/all" -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do
+
+# Check examples/all/sdl3
+"$ODIN" check "$here/examples/all/sdl3" -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -no-entry-point
+
+# Internals tests
+(
+	cd "$here/tests/internal"
+	"$ODIN" test . -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true -sanitize:address
+)
+
+# Normal Core library tests
+(
+	cd "$here/tests/core"
+	"$ODIN" test normal.odin -file -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true -sanitize:address
+)
+
+# Vendor library tests
+vendor_build="$here/tests/vendor/build"
+mkdir -p "$vendor_build"
+cp "$here"/vendor/lua/5.4/linux/*.so "$vendor_build"/
+# We are possibly on Windows, so copy the DLLs as well.
+cp "$here"/vendor/lua/5.4/windows/*.dll "$vendor_build"/
+(
+	cd "$vendor_build"
+	LD_LIBRARY_PATH="$vendor_build${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" "$ODIN" test .. -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true -sanitize:address
+)
+rm -rf "$vendor_build"
+
+# Check issues
+(
+	cd "$here/tests/issues"
+	./run.sh
+)
+
+# The ABI tests can be disabled because they require clang at the moment.
+#   TODO: Maybe try to make them work with msvc as well?
+if [[ -z "${ODIN_TESTS_NO_CLANG:-}" ]]; then
+	# Run ABI tests
+	(
+		cd "$here/tests/abi"
+		ABI_CFLAGS= ./run.sh
+		ABI_CFLAGS=-O2 ./run.sh -o:speed
+	)
+fi
+
+# More extensive tests (non-slim):
+if [[ -z "${SLIM:-}" ]]; then
+
+	echo "Running extended tests..."
+
+	# Optimized Core library tests
+	(
+		cd "$here/tests/core"
+		"$ODIN" test speed.odin -o:speed -file -all-packages -vet -vet-tabs -strict-style -vet-style -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -define:ODIN_TEST_FAIL_ON_BAD_MEMORY=true
+	)
+
+	# Wycheproof tests
+	(
+		cd "$here/tests/core"
+		"$ODIN" test crypto/wycheproof -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
+	)
+
+	# Noise Protocol Framework tests
+	(
+		cd "$here/tests/core"
+		"$ODIN" test crypto/noise -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
+	)
+
+	# X.509 limbo tests
+	(
+		cd "$here/tests/core"
+		"$ODIN" test crypto/x509_limbo -vet -vet-tabs -strict-style -vet-style -vet-cast -warnings-as-errors -disallow-do -define:ODIN_TEST_FANCY=false -o:speed
+	)
+
+	echo "SUCCESS:  Extended tests have been executed successfully."
+	echo "Note: You can call  \"run_tests slim\"  to omit some of the slower tests."
+
+else
+	echo "SUCCESS:  Slim tests have been executed successfully."
+
+fi
+
+if [[ -n "${ODIN_TESTS_NO_CLANG:-}" ]]; then
+	echo "WARNING:  ODIN_TESTS_NO_CLANG specified - ABI tests have been skipped."
+fi
diff --git a/src/check_escape.cpp b/src/check_escape.cpp
index 24a8e5abb..1484271ef 100644
--- a/src/check_escape.cpp
+++ b/src/check_escape.cpp
@@ -3396,6 +3396,7 @@ gb_internal void escape_stmt(EscapeAnalysis *ea, Ast *node) {
 	case_end;
 
 	case_ast_node(rs, RangeStmt, node);
+		escape_stmt(ea, rs->init);
 		Ast *val0 = nullptr;
 		Ast *val1 = nullptr;
 		if (rs->vals.count > 0) {
@@ -3416,9 +3417,11 @@ gb_internal void escape_stmt(EscapeAnalysis *ea, Ast *node) {
 			escape_nil_scan(ea, rs->expr);
 		}
 		escape_loop(ea, node, nullptr, nullptr, rs->body, val0, val1, rs->expr);
+		escape_forget(ea, rs->init);
 	case_end;
 
 	case_ast_node(rs, UnrollRangeStmt, node);
+		escape_stmt(ea, rs->init);
 		bool by_ref = false;
 		Ast *vals[2] = {rs->val0, rs->val1};
 		for (Ast *val : vals) {
@@ -3431,6 +3434,7 @@ gb_internal void escape_stmt(EscapeAnalysis *ea, Ast *node) {
 			escape_nil_scan(ea, rs->expr);
 		}
 		escape_loop(ea, node, nullptr, nullptr, rs->body, rs->val0, rs->val1, rs->expr);
+		escape_forget(ea, rs->init);
 	case_end;
 
 	case_ast_node(ss, SwitchStmt, node);
diff --git a/src/llvm_backend_general.cpp b/src/llvm_backend_general.cpp
index 504a22ee9..d6593a85a 100644
--- a/src/llvm_backend_general.cpp
+++ b/src/llvm_backend_general.cpp
@@ -3885,6 +3885,10 @@ general_end:;
 		max_align = gb_max(max_align, 16);
 
 		LLVMValueRef ptr = llvm_alloca(p, dst_type, max_align);
+		if (dst_size > src_size) {
+			// NOTE(bill): the bytes past `src` are padding and must read as zero
+			LLVMBuildStore(p->builder, LLVMConstNull(dst_type), ptr);
+		}
 
 		LLVMValueRef nptr = LLVMBuildPointerCast(p->builder, ptr, LLVMPointerType(src_type, 0), "");
 		LLVMBuildStore(p->builder, val, nptr);
diff --git a/tests/abi/.gitignore b/tests/abi/.gitignore
index e390b124a..ecc2bbb49 100644
--- a/tests/abi/.gitignore
+++ b/tests/abi/.gitignore
@@ -1 +1,2 @@
-build/**
\ No newline at end of file
+build/**
+build-cross/**
diff --git a/tests/abi/run.bat b/tests/abi/run.bat
index db03eda3b..e61cb5073 100644
--- a/tests/abi/run.bat
+++ b/tests/abi/run.bat
@@ -24,6 +24,7 @@ REM Odin side needs to match
 set TIER_GNU=false
 set TIER_F16=false
 set TIER_I128=false
+clang --version || exit /b
 clang -E tiers.c 2>nul | findstr /C:"ABI_YES_GNU" >nul && set TIER_GNU=true
 clang -E tiers.c 2>nul | findstr /C:"ABI_YES_F16" >nul && set TIER_F16=true
 clang -E tiers.c 2>nul | findstr /C:"ABI_YES_I128" >nul && set TIER_I128=true
diff --git a/tests/abi/run.sh b/tests/abi/run.sh
index 80bc273f6..1275d4a74 100755
--- a/tests/abi/run.sh
+++ b/tests/abi/run.sh
@@ -25,7 +25,9 @@ here=$(cd "$(dirname "$0")" && pwd)
 COMMON="-define:ODIN_TEST_FANCY=false -file -vet -strict-style -ignore-unused-defineables"
 
 CC_TARGET=""; [ -n "$TRIPLE" ] && CC_TARGET="--target=$TRIPLE"
-ODIN_TARGET="-microarch:native"; [ -n "$TARGET" ] && ODIN_TARGET="-target:$TARGET"
+
+HOST_MARCH=""; case "$(uname -m)" in x86_64|amd64) HOST_MARCH="-microarch:x86-64" ;; esac
+ODIN_TARGET="$HOST_MARCH"; [ -n "$TARGET" ] && ODIN_TARGET="-target:$TARGET"
 
 
 # Cleaned BEFORE, not after: the generated corpus is left in place so it can be
@@ -36,7 +38,7 @@ pushd "$here/build" > /dev/null
 
 set -x
 
-$ODIN run ../gen.odin -file -microarch:native -- .
+$ODIN run ../gen.odin -file $HOST_MARCH -- .
 
 # Ask the C compiler which tiers it has, by preprocessing the generated `build-cross/tiers.c`. 
 # The Odin side must use the same tiers or it references symbols C never emitted.
diff --git a/tests/core/download_assets.py b/tests/core/download_assets.py
index 6e6bf83b8..11b984612 100644
--- a/tests/core/download_assets.py
+++ b/tests/core/download_assets.py
@@ -698,6 +698,8 @@ def main():
 		debug = True
 
 	for suite in TEST_SUITES:
+		print("Downloading test assets: {}\n".format(suite))
+		sys.stdout.flush()
 		base_path = sys.argv[1] + "/{}".format(suite)
 		# Make assets path
 		try:
@@ -712,6 +714,7 @@ def main():
 
 		# We could fall back on downloading the PNG files individually, but it's slow
 		print("Done downloading {} assets.\n".format(suite))
+		sys.stdout.flush()
 
 	return 0
 
diff --git a/tests/issues/.gitignore b/tests/issues/.gitignore
new file mode 100644
index 000000000..f65519e3c
--- /dev/null
+++ b/tests/issues/.gitignore
@@ -0,0 +1 @@
+build/**
diff --git a/tests/issues/run.bat b/tests/issues/run.bat
index 3473e9614..1a2f0df7d 100644
--- a/tests/issues/run.bat
+++ b/tests/issues/run.bat
@@ -1,9 +1,10 @@
 @echo off
+setlocal EnableDelayedExpansion
 
 if not exist "build\" mkdir build
 pushd build
 
-set COMMON=-define:ODIN_TEST_FANCY=false -vet -strict-style -ignore-unused-defineables
+set COMMON=-define:ODIN_TEST_FANCY=false -vet -strict-style -ignore-unused-defineables -show-timings
 set ODIN=..\..\..\odin
 
 @echo on
@@ -33,9 +34,9 @@ set ODIN=..\..\..\odin
 
 @rem "odin check" tests:
 %ODIN% check "..\test_issue_5105_5569" %COMMON% 2>&1 | find /c "Error:" | findstr /x "4" || exit /b
-%ODIN% check "..\test_issue_6484" -no-entry-point %COMMON%  || exit /b
+%ODIN% check "..\test_issue_6484" -no-entry-point %COMMON% || exit /b
 %ODIN% check "..\test_issue_6874" %COMMON% 2>&1 | find /c "Error:" | findstr /x "1" || exit /b
-%ODIN% check "..\test_issue_6979" -no-entry-point %COMMON%  || exit /b
+%ODIN% check "..\test_issue_6979" -no-entry-point %COMMON% || exit /b
 %ODIN% check "..\test_issue_7012" -no-entry-point %COMMON% || exit /b
 %ODIN% check "..\test_issue_7260" -no-entry-point %COMMON% || exit /b
 %ODIN% check "..\test_issue_7304" %COMMON% 2>&1 | find /c "9223372036854775808 is not representable by int" | findstr /x "1" || exit /b
@@ -92,8 +93,30 @@ set ODIN=..\..\..\odin
 
 @rem #########################################################################################################
 
+@rem Test clang - improve error message for users that don't have it.
+
+@if "%ODIN_TESTS_NO_CLANG%" == "" (
+	@echo Testing for clang...
+	clang --version
+	if !ERRORLEVEL! neq 0 (
+		@echo ERROR: clang not working. This is required for some tests.
+		@echo You can try msvc instead:  set ODIN_TESTS_NO_CLANG=1
+		exit /b
+	)
+) else (
+	@echo Testing for msvc...
+	cl
+	if !ERRORLEVEL! neq 0 (
+		@echo ERROR: msvc not working. This is required for some tests.
+		@echo You can try clang instead:  set ODIN_TESTS_NO_CLANG=
+		exit /b
+	)
+)
+
+@rem #########################################################################################################
+
 @rem "odin test" tests with special needs, or others (e.g. "odin doc"):
-if "%ISSUES_TESTS_NO_CLANG%" == "" (
+@if "%ODIN_TESTS_NO_CLANG%" == "" (
 	clang -c "..\test_issue_5640\test_issue_5640.c" -o test_issue_5640_c.o || exit /b
 ) else (
 	cl -c "..\test_issue_5640\test_issue_5640.c" /Fo:test_issue_5640_c.o || exit /b
@@ -101,7 +124,7 @@ if "%ISSUES_TESTS_NO_CLANG%" == "" (
 
 %ODIN% test "..\test_issue_5640" %COMMON% || exit /b
 
-if "%ISSUES_TESTS_NO_CLANG%" == "" (
+@if "%ODIN_TESTS_NO_CLANG%" == "" (
 	clang -c "..\test_issue_6809_6816\test_issue_6809_6816.c" -o test_issue_6809_6816_c.o -O3 || exit /b
 ) else (
 	cl -c "..\test_issue_6809_6816\test_issue_6809_6816.c" /Fo:test_issue_6809_6816_c.o -O3 || exit /b
@@ -120,7 +143,7 @@ fc /b pr_7848.cbor pr_7848_again.cbor > nul || exit /b
 %ODIN% test "..\test_pr_7848" %COMMON% || exit /b
 
 @rem It seems at this point 7010 is not for Windows.
-@rem if "%ISSUES_TESTS_NO_CLANG%" == "" (
+@rem @if "%ODIN_TESTS_NO_CLANG%" == "" (
 @rem 	clang -c "..\test_issue_7010\test_issue_7010.c" -o test_issue_7010_c.o || exit /b
 @rem 	%ODIN% test "..\test_issue_7010" %COMMON% || exit /b
 @rem ) else (
@@ -140,7 +163,7 @@ fc /b pr_7848.cbor pr_7848_again.cbor > nul || exit /b
 %ODIN% test "..\test_lifetime_markers" %COMMON% -o:size -lifetime-markers || exit /b
 %ODIN% test "..\test_lifetime_markers" %COMMON% -o:speed -lifetime-markers || exit /b
 
-if "%ISSUES_TESTS_NO_CLANG%" == "" (
+@if "%ODIN_TESTS_NO_CLANG%" == "" (
 	clang -c "..\test_issue_sysv_abi\test_issue_sysv_abi.c" -o test_issue_sysv_abi_c.o || exit /b
 ) else (
 	cl -c "..\test_issue_sysv_abi\test_issue_sysv_abi.c" /Fo:test_issue_sysv_abi_c.o || exit /b
diff --git a/tests/issues/run.sh b/tests/issues/run.sh
index a04cf76ef..73d886cb7 100755
--- a/tests/issues/run.sh
+++ b/tests/issues/run.sh
@@ -4,8 +4,8 @@ set -eu
 mkdir -p build
 pushd build
 ODIN=../../../odin
-COMMON="-define:ODIN_TEST_FANCY=false -vet -strict-style -ignore-unused-defineables -microarch:native"
-COMMON_CHECK="-define:ODIN_TEST_FANCY=false -vet -strict-style -ignore-unused-defineables"
+COMMON="-define:ODIN_TEST_FANCY=false -vet -strict-style -ignore-unused-defineables -show-timings -microarch:native"
+COMMON_CHECK="-define:ODIN_TEST_FANCY=false -vet -strict-style -ignore-unused-defineables -show-timings"
 
 set -x
 
@@ -18,7 +18,7 @@ set -x
 #   update `run.bat` as well.
 
 # Some tests require a C compiler.
-#   By default, it uses clang.  export ISSUES_TESTS_NO_CLANG=1  to disable these tests.
+#   By default, it uses clang.  export ODIN_TESTS_NO_CLANG=1  to disable these tests.
 #   TODO: See if we can make the tests work with gcc instead?
 
 #########################################################################################################
@@ -276,11 +276,26 @@ $ODIN run ../test_issue_7798 $COMMON
 
 #########################################################################################################
 
+#
+# Test clang - improve error message for users that don't have it.
+#
+
+if [[ -z ${ODIN_TESTS_NO_CLANG+x} ]]; then
+	if ! clang --version; then
+		set +x
+		echo "ERROR: clang not working. This is required for some tests."
+		echo "You can disable tests that require clang:  export ODIN_TESTS_NO_CLANG=1"
+		exit 1
+	fi
+fi
+
+#########################################################################################################
+
 #
 # "odin test" tests with special needs, or others (e.g. "odin doc"):
 #
 
-if [[ -z ${ISSUES_TESTS_NO_CLANG+x} ]]; then
+if [[ -z ${ODIN_TESTS_NO_CLANG+x} ]]; then
 	clang -c ../test_issue_5640/test_issue_5640.c -o test_issue_5640_c.o
 
 	if [[ "$(uname)" != "NetBSD" ]]; then
@@ -290,7 +305,7 @@ if [[ -z ${ISSUES_TESTS_NO_CLANG+x} ]]; then
 	fi
 fi
 
-if [[ -z ${ISSUES_TESTS_NO_CLANG+x} ]]; then
+if [[ -z ${ODIN_TESTS_NO_CLANG+x} ]]; then
 	clang -c ../test_issue_6809_6816/test_issue_6809_6816.c -o test_issue_6809_6816_c.o -O3
 	$ODIN test ../test_issue_6809_6816 -o:speed $COMMON
 fi
@@ -310,7 +325,7 @@ $ODIN check ../test_pr_7848/pkg_b ../test_pr_7848/pkg_a -no-entry-point -workspa
 cmp pr_7848.cbor pr_7848_again.cbor
 $ODIN test ../test_pr_7848 $COMMON
 
-if [[ -z ${ISSUES_TESTS_NO_CLANG+x} ]]; then
+if [[ -z ${ODIN_TESTS_NO_CLANG+x} ]]; then
 	clang -c ../test_issue_7010/test_issue_7010.c -o test_issue_7010_c.o
 	$ODIN test ../test_issue_7010 $COMMON
 fi
@@ -348,13 +363,13 @@ fi
 $ODIN test ../test_lifetime_markers $COMMON -o:size -lifetime-markers
 $ODIN test ../test_lifetime_markers $COMMON -o:speed -lifetime-markers
 
-if [[ -z ${ISSUES_TESTS_NO_CLANG+x} ]]; then
+if [[ -z ${ODIN_TESTS_NO_CLANG+x} ]]; then
 	clang -c ../test_issue_sysv_abi/test_issue_sysv_abi.c -o test_issue_sysv_abi_c.o
 	$ODIN test ../test_issue_sysv_abi $COMMON
 fi
 
 # AVX-512 asked for through -target-features on the default microarch; needs a CPU that has it
-if [[ -z ${ISSUES_TESTS_NO_CLANG+x} ]]; then
+if [[ -z ${ODIN_TESTS_NO_CLANG+x} ]]; then
 	if grep -qw avx512f /proc/cpuinfo 2>/dev/null; then
 		clang -c ../test_issue_avx512_vector_abi/test_issue_avx512_vector_abi.c -o test_issue_avx512_vector_abi_c.o -mavx512f
 		$ODIN test ../test_issue_avx512_vector_abi $COMMON_CHECK -target-features:avx512f
@@ -366,7 +381,7 @@ $ODIN test ../test_issue_loaded_pointer_alignment $COMMON -o:speed
 
 #########################################################################################################
 
-if [[ ! -z ${ISSUES_TESTS_NO_CLANG+x} ]]; then
+if [[ ! -z ${ODIN_TESTS_NO_CLANG+x} ]]; then
 	echo "!!! WARNING !!! Tests that require clang have been skipped"
 fi
 
diff --git a/tests/vendor/.gitignore b/tests/vendor/.gitignore
new file mode 100644
index 000000000..f65519e3c
--- /dev/null
+++ b/tests/vendor/.gitignore
@@ -0,0 +1 @@
+build/**