autofree: add option_reassigned.v and option_simple.v tests.

vlib/v/tests/valgrind/option_reassigned.v

@@ -0,0 +1,9 @@
+import os
+
+fn main() {
+	mut a := 'abc'
+	a = os.find_abs_path_of_executable('ls') or {
+		''
+	}
+	eprintln(a)
+}

vlib/v/tests/valgrind/option_simple.v

@@ -0,0 +1,8 @@
+import os
+
+fn main() {
+	a := os.find_abs_path_of_executable('ls') or {
+		''
+	}
+	eprintln(a)
+}

vlib/v/tests/valgrind/valgrind_test.v

@@ -4,11 +4,25 @@ import benchmark
 import v.util
 import v.util.vtest
 
+//
+// NB: skip_compile_files can be used for totally skipping .v files temporarily.
+// .v files in skip_valgrind_files will be compiled, but will not be run under
+// valgrind. This ensures that at least the generated code does not have C syntax
+// errors.
+// Use: `./v -d noskipcompile vlib/v/tests/valgrind/valgrind_test.v` to ignore the
+// skip_compile_files list.
+// Use: `./v -d noskip vlib/v/tests/valgrind/valgrind_test.v` to ignore skip_valgrind_files
+// Use: `./v -d noskipcompile -d noskip vlib/v/tests/valgrind/valgrind_test.v` to ignore both
+//
 const (
+	skip_compile_files  = [
+		'vlib/v/tests/valgrind/option_reassigned.v',
+	]
 	skip_valgrind_files = [
 		'vlib/v/tests/valgrind/struct_field.v',
 		'vlib/v/tests/valgrind/fn_returning_string_param.v',
 		'vlib/v/tests/valgrind/fn_with_return_should_free_local_vars.v',
+		'vlib/v/tests/valgrind/option_simple.v',
 	]
 )
 
@@ -50,14 +64,8 @@ fn test_all() {
 	bench.set_total_expected_steps(tests.len)
 	for test in tests {
 		bench.step()
-		if !test.contains('1.') {
-			bench.skip()
-			eprintln(bench.step_message_skip(test))
-			continue
-		}
-		//
-		if test in skip_valgrind_files {
-			$if !noskip ? {
+		if test in skip_compile_files {
+			$if !noskipcompile ? {
 				bench.skip()
 				eprintln(bench.step_message_skip(test))
 				continue
@@ -79,6 +87,13 @@ fn test_all() {
 			eprintln(res.output)
 			continue
 		}
+		if test in skip_valgrind_files {
+			$if !noskip ? {
+				bench.skip()
+				eprintln(bench.step_message_skip(test))
+				continue
+			}
+		}
 		valgrind_cmd := 'valgrind --error-exitcode=1 --leak-check=full $exe_filename'
 		vprintln('valgrind cmd: ${util.bold(valgrind_cmd)}')
 		valgrind_res := os.exec(valgrind_cmd) or {