Change mimic marker symbol from "!!" to "¿"
diff --git a/cmd/wuffs-c/test.go b/cmd/wuffs-c/test.go
index 8d6fb6f..e9853e8 100644
--- a/cmd/wuffs-c/test.go
+++ b/cmd/wuffs-c/test.go
@@ -155,7 +155,7 @@
 	s := bufio.NewScanner(f)
 	for s.Scan() {
 		t := s.Text()
-		const prefix = "// !! wuffs mimic cflags:"
+		const prefix = "// ¿ wuffs mimic cflags:"
 		if strings.HasPrefix(t, prefix) {
 			t = strings.TrimSpace(t[len(prefix):])
 			return strings.Split(t, " "), nil
diff --git a/test/c/std/adler32.c b/test/c/std/adler32.c
index a6e141e..524ebbf 100644
--- a/test/c/std/adler32.c
+++ b/test/c/std/adler32.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC -lz
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC -lz
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/bmp.c b/test/c/std/bmp.c
index fbb8f02..118497b 100644
--- a/test/c/std/bmp.c
+++ b/test/c/std/bmp.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/cbor.c b/test/c/std/cbor.c
index 8592280..59981c9 100644
--- a/test/c/std/cbor.c
+++ b/test/c/std/cbor.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/crc32.c b/test/c/std/crc32.c
index f4f8967..72b3c21 100644
--- a/test/c/std/crc32.c
+++ b/test/c/std/crc32.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC -lz
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC -lz
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/deflate.c b/test/c/std/deflate.c
index 4d80263..b531112 100644
--- a/test/c/std/deflate.c
+++ b/test/c/std/deflate.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC -lz
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC -lz
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/gif.c b/test/c/std/gif.c
index 4446747..65341b6 100644
--- a/test/c/std/gif.c
+++ b/test/c/std/gif.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC -lgif
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC -lgif
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/gzip.c b/test/c/std/gzip.c
index fe4745e..358126e 100644
--- a/test/c/std/gzip.c
+++ b/test/c/std/gzip.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC -lz
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC -lz
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/json.c b/test/c/std/json.c
index 59ddd9b..f318435 100644
--- a/test/c/std/json.c
+++ b/test/c/std/json.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/lzw.c b/test/c/std/lzw.c
index 6cc411f..c9b7598 100644
--- a/test/c/std/lzw.c
+++ b/test/c/std/lzw.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/nie.c b/test/c/std/nie.c
index 8958ce1..55ab6e5 100644
--- a/test/c/std/nie.c
+++ b/test/c/std/nie.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/png.c b/test/c/std/png.c
index b4e94a9..269e316 100644
--- a/test/c/std/png.c
+++ b/test/c/std/png.c
@@ -41,7 +41,7 @@
 // -lm and -lz (and nothing else). It's easiest to just link with the union of
 // all of these libraries.
 //
-// !! wuffs mimic cflags: -DWUFFS_MIMIC -lm -lpng -lz
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC -lm -lpng -lz
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/wbmp.c b/test/c/std/wbmp.c
index e4b5bc9..a95c4c3 100644
--- a/test/c/std/wbmp.c
+++ b/test/c/std/wbmp.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
diff --git a/test/c/std/zlib.c b/test/c/std/zlib.c
index 5107a35..921b0c4 100644
--- a/test/c/std/zlib.c
+++ b/test/c/std/zlib.c
@@ -37,7 +37,7 @@
 "wuffs mimic cflags" to run the mimic benchmarks.
 */
 
-// !! wuffs mimic cflags: -DWUFFS_MIMIC -lz
+// ¿ wuffs mimic cflags: -DWUFFS_MIMIC -lz
 
 // Wuffs ships as a "single file C library" or "header file library" as per
 // https://github.com/nothings/stb/blob/master/docs/stb_howto.txt