diff --git a/runtime/syntax/testdir/dumps/c_00.dump b/runtime/syntax/testdir/dumps/c_00.dump
index 46c42f1..30630c8 100644
--- a/runtime/syntax/testdir/dumps/c_00.dump
+++ b/runtime/syntax/testdir/dumps/c_00.dump
@@ -1,4 +1,5 @@
 >/+0#0000e05#ffffff0|*| |v|i|:|s|e|t| |t|s|=|8+0#e000002&| +0#0000e05&|s|t|s|=|4+0#e000002&| +0#0000e05&|s|w|=|4+0#e000002&| +0#0000e05&|n|o|e|t|:| +0#0000000&@43
+| +0#0000e05&|*| |T|E|S|T|_|S|E|T|U|P| |l|e|t| |g|:|c|_|c|o|m@1|e|n|t|_|s|t|r|i|n|g|s| |=| |1+0#e000002&| +0#0000000&@33
 | +0#0000e05&|*| +0#0000000&@72
 | +0#0000e05&|*| |V|I|M| |-| |V|i| |I|M|p|r|o|v|e|d| @3|b|y| |B|r|a|m| |M|o@1|l|e|n|a@1|r| +0#0000000&@33
 | +0#0000e05&|*| +0#0000000&@72
@@ -16,5 +17,4 @@
 @32|/+0#0000e05&@1| |c|y|g|w|i|n|_|c|o|n|v|_|p|a|t|h|(|)| +0#0000000&@21
 |#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|l|i|m|i|t|s|.|h|>| +0#0000000&@54
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
-@75
 @57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/c_01.dump b/runtime/syntax/testdir/dumps/c_01.dump
index cd6ae05..dd69a19 100644
--- a/runtime/syntax/testdir/dumps/c_01.dump
+++ b/runtime/syntax/testdir/dumps/c_01.dump
@@ -1,9 +1,10 @@
-|#+0#e000e06#ffffff0| |i|n|c|l|u|d|e| |<+0#e000002&|c|y|g|w|i|n|/|v|e|r|s|i|o|n|.|h|>| +0#0000000&@46
+|#+0#e000e06#ffffff0|i|f|d|e|f| |_@1|C|Y|G|W|I|N|_@1| +0#0000000&@57
+|#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|c|y|g|w|i|n|/|v|e|r|s|i|o|n|.|h|>| +0#0000000&@46
 |#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|s|y|s|/|c|y|g|w|i|n|.|h|>| +0#0000000&@7|/+0#0000e05&@1| |f|o|r| |c|y|g|w|i|n|_|c|o|n|v|_|t|o|_|p|o|s|i|x|_|p|a|t|h|(|)| |a|n|d|/|o|r| +0#0000000&@1
 @32|/+0#0000e05&@1| |c|y|g|w|i|n|_|c|o|n|v|_|p|a|t|h|(|)| +0#0000000&@21
 |#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|l|i|m|i|t|s|.|h|>| +0#0000000&@54
-|#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
-> @74
+>#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
+@75
 |#+0#e000e06&|i|f| |d|e|f|i|n|e|d|(|M|S|W|I|N|)| |&@1| |(|!|d|e|f|i|n|e|d|(|F|E|A|T|_|G|U|I|_|M|S|W|I|N|)| ||@1| |d|e|f|i|n|e|d|(|V|I|M|D|L@1|)@1| +0#0000000&@7
 |#+0#e000e06&| |i|n|c|l|u|d|e| |"+0#e000002&|i|s|c|y|g|p|t|y|.|h|"| +0#0000000&@52
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
@@ -16,5 +17,4 @@
 |#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|T|A|G| @3|3+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |t|a|g| |n|a|m|e| |a|r|g|u|m|e|n|t| |g|i|v|e|n|,| |u|s|e| |t|a|g|n|a|m|e| +0#0000000&@7
 |#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|Q|F| @4|4+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |s|t|a|r|t| |i|n| |q|u|i|c|k|f|i|x| |m|o|d|e| +0#0000000&@21
 @75
-|#+0#e000e06&|i|f| |(|d|e|f|i|n|e|d|(|U|N|I|X|)| ||@1| |d|e|f|i|n|e|d|(|V|M|S|)@1| |&@1| |!|d|e|f|i|n|e|d|(|N|O|_|V|I|M|_|M|A|I|N|)| +0#0000000&@14
-@57|1|9|,|0|-|1| @7|1|2|%| 
+@57|1|9|,|1| @9|1|2|%| 
diff --git a/runtime/syntax/testdir/dumps/c_02.dump b/runtime/syntax/testdir/dumps/c_02.dump
index 82820ff..72ab11f 100644
--- a/runtime/syntax/testdir/dumps/c_02.dump
+++ b/runtime/syntax/testdir/dumps/c_02.dump
@@ -1,9 +1,10 @@
-|s+0#00e0003#ffffff0|t|a|t|i|c| +0#0000000&|i+0#00e0003&|n|t| +0#0000000&|f|i|l|e|_|o|w|n|e|d|(|c+0#00e0003&|h|a|r| +0#0000000&|*|f|n|a|m|e|)|;| @39
+|#+0#e000e06#ffffff0|i|f| |(|d|e|f|i|n|e|d|(|U|N|I|X|)| ||@1| |d|e|f|i|n|e|d|(|V|M|S|)@1| |&@1| |!|d|e|f|i|n|e|d|(|N|O|_|V|I|M|_|M|A|I|N|)| +0#0000000&@14
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|i+0#00e0003&|n|t| +0#0000000&|f|i|l|e|_|o|w|n|e|d|(|c+0#00e0003&|h|a|r| +0#0000000&|*|f|n|a|m|e|)|;| @39
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|m|a|i|n|e|r@1|(|i+0#00e0003&|n|t|,+0#0000000&| |c|h|a|r|_|u| |*|)|;| @39
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|e|a|r|l|y|_|a|r|g|_|s|c|a|n|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|)|;| @31
-|#+0#e000e06&|i|f|n|d|e|f| |N|O|_|V|I|M|_|M|A|I|N| +0#0000000&@55
->s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|u|s|a|g|e|(|v+0#00e0003&|o|i|d|)+0#0000000&|;| @50
+>#+0#e000e06&|i|f|n|d|e|f| |N|O|_|V|I|M|_|M|A|I|N| +0#0000000&@55
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|u|s|a|g|e|(|v+0#00e0003&|o|i|d|)+0#0000000&|;| @50
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|p|a|r|s|e|_|c|o|m@1|a|n|d|_|n|a|m|e|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|)|;| @27
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|c|o|m@1|a|n|d|_|l|i|n|e|_|s|c|a|n|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|)|;| @28
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|c|h|e|c|k|_|t@1|y|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|)|;| @36
@@ -16,5 +17,4 @@
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|m|a|i|n|_|s|t|a|r|t|_|g|u|i|(|v+0#00e0003&|o|i|d|)+0#0000000&|;| @41
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|c|h|e|c|k|_|s|w|a|p|_|e|x|i|s|t|s|_|a|c|t|i|o|n|(|v+0#00e0003&|o|i|d|)+0#0000000&|;| @31
 |#+0#e000e06&| |i|f|d|e|f| |F|E|A|T|_|E|V|A|L| +0#0000000&@57
-|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|s|e|t|_|p|r|o|g|p|a|t|h|(|c|h|a|r|_|u| |*|a|r|g|v|0|)|;| @34
-@57|3|7|,|1| @9|3|0|%| 
+@57|3|7|,|1| @9|2|9|%| 
diff --git a/runtime/syntax/testdir/dumps/c_03.dump b/runtime/syntax/testdir/dumps/c_03.dump
index 5f0e8d8..17c6f3b 100644
--- a/runtime/syntax/testdir/dumps/c_03.dump
+++ b/runtime/syntax/testdir/dumps/c_03.dump
@@ -1,9 +1,10 @@
-|s+0#00e0003#ffffff0|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|s|e|t|_|p|r|o|g|p|a|t|h|(|c|h|a|r|_|u| |*|a|r|g|v|0|)|;| @34
+|#+0#e000e06#ffffff0| |i|f|d|e|f| |F|E|A|T|_|E|V|A|L| +0#0000000&@57
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|s|e|t|_|p|r|o|g|p|a|t|h|(|c|h|a|r|_|u| |*|a|r|g|v|0|)|;| @34
 |#+0#e000e06&| |e|n|d|i|f| +0#0000000&@67
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
 @75
-@75
->/+0#0000e05&|*| +0#0000000&@72
+> @74
+|/+0#0000e05&|*| +0#0000000&@72
 | +0#0000e05&|*| |D|i|f@1|e|r|e|n|t| |t|y|p|e|s| |o|f| |e|r@1|o|r| |m|e|s@1|a|g|e|s|.| +0#0000000&@37
 | +0#0000e05&|*|/| +0#0000000&@71
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|c+0#00e0003&|h|a|r| +0#0000000&|*|(|m|a|i|n|_|e|r@1|o|r|s|[|]|)| |=| @44
@@ -16,5 +17,4 @@
 |#+0#e000e06&|d|e|f|i|n|e| |M|E|_|A|R|G|_|M|I|S@1|I|N|G| @9|2+0#e000002&| +0#0000000&@41
 @4|N|_|(|"+0#e000002&|G|a|r|b|a|g|e| |a|f|t|e|r| |o|p|t|i|o|n| |a|r|g|u|m|e|n|t|"|)+0#0000000&|,| @34
 |#+0#e000e06&|d|e|f|i|n|e| |M|E|_|G|A|R|B|A|G|E| @13|3+0#e000002&| +0#0000000&@41
-|@+0#4040ff13&@2| @71
-| +0#0000000&@56|5@1|,|1| @9|4|7|%| 
+@57|5@1|,|0|-|1| @7|4|7|%| 
diff --git a/runtime/syntax/testdir/dumps/c_04.dump b/runtime/syntax/testdir/dumps/c_04.dump
index 9864b88..03804a5 100644
--- a/runtime/syntax/testdir/dumps/c_04.dump
+++ b/runtime/syntax/testdir/dumps/c_04.dump
@@ -3,8 +3,8 @@
 |#+0#e000e06&|d|e|f|i|n|e| |M|E|_|E|X|T|R|A|_|C|M|D| @11|4+0#e000002&| +0#0000000&@41
 @4|N|_|(|"+0#e000002&|I|n|v|a|l|i|d| |a|r|g|u|m|e|n|t| |f|o|r|"|)+0#0000000&|,| @43
 |#+0#e000e06&|d|e|f|i|n|e| |M|E|_|I|N|V|A|L|I|D|_|A|R|G| @9|5+0#e000002&| +0#0000000&@41
-|}|;| @72
-> @74
+>}|;| @72
+@75
 |#+0#e000e06&|i|f|n|d|e|f| |P|R|O|T|O| @10|/+0#0000e05&@1| |d|o|n|'|t| |w|a|n|t| |a| |p|r|o|t|o|t|y|p|e| |f|o|r| |m|a|i|n|(|)| +0#0000000&@14
 @75
 |/+0#0000e05&@1| |V|a|r|i|o|u|s| |p|a|r|a|m|e|t|e|r|s| |p|a|s@1|e|d| |b|e|t|w|e@1|n| |m|a|i|n|(|)| |a|n|d| |o|t|h|e|r| |f|u|n|c|t|i|o|n|s|.| +0#0000000&@10
@@ -17,4 +17,4 @@
 |#+0#e000e06&|i|f|n|d|e|f| |N|O|_|V|I|M|_|M|A|I|N| @4|/+0#0000e05&@1| |s|k|i|p| |t|h|i|s| |f|o|r| |u|n|i|t@1|e|s|t|s| +0#0000000&@24
 @75
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|c|h|a|r|_|u| |*|s|t|a|r|t|_|d|i|r| |=| |N+0#e000002&|U|L@1|;+0#0000000&| @7|/+0#0000e05&@1| |c|u|r@1|e|n|t| |w|o|r|k|i|n|g| |d|i|r| |o|n| |s|t|a|r|t|u|p| +0#0000000&@1
-@57|7|3|,|0|-|1| @7|6|4|%| 
+@57|7|3|,|1| @9|6|4|%| 
diff --git a/runtime/syntax/testdir/dumps/c_05.dump b/runtime/syntax/testdir/dumps/c_05.dump
index 5b977ea..6871cd0 100644
--- a/runtime/syntax/testdir/dumps/c_05.dump
+++ b/runtime/syntax/testdir/dumps/c_05.dump
@@ -1,9 +1,10 @@
-| +0&#ffffff0@74
+|s+0#00e0003#ffffff0|t|a|t|i|c| +0#0000000&|c|h|a|r|_|u| |*|s|t|a|r|t|_|d|i|r| |=| |N+0#e000002&|U|L@1|;+0#0000000&| @7|/+0#0000e05&@1| |c|u|r@1|e|n|t| |w|o|r|k|i|n|g| |d|i|r| |o|n| |s|t|a|r|t|u|p| +0#0000000&@1
+@75
 |s+0#00e0003&|t|a|t|i|c| +0#0000000&|i+0#00e0003&|n|t| +0#0000000&|h|a|s|_|d|a|s|h|_|c|_|a|r|g| |=| |F|A|L|S|E|;| @40
 @75
 |#+0#e000e06&| |i|f|d|e|f| |V|I|M|D|L@1| +0#0000000&@60
-|_@1|d|e|c|l|s|p|e|c|(|d|l@1|e|x|p|o|r|t|)| @53
->#+0#e000e06&| |e|n|d|i|f| +0#0000000&@67
+>_@1|d|e|c|l|s|p|e|c|(|d|l@1|e|x|p|o|r|t|)| @53
+|#+0#e000e06&| |e|n|d|i|f| +0#0000000&@67
 @4|i+0#00e0003&|n|t| +0#0000000&@67
 |#+0#e000e06&| |i|f|d|e|f| |M|S|W|I|N| +0#0000000&@61
 |V|i|m|M|a|i|n| @67
@@ -16,5 +17,4 @@
 @4|i+0#00e0003&|n|t| +0#0000000&@8|i|;| @56
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
 @75
-@4|/+0#0000e05&|*| +0#0000000&@68
-@57|9|1|,|1| @9|8|2|%| 
+@57|9|1|,|1| @9|8|1|%| 
diff --git a/runtime/syntax/testdir/dumps/c_06.dump b/runtime/syntax/testdir/dumps/c_06.dump
index fd7fe90..55b9f38 100644
--- a/runtime/syntax/testdir/dumps/c_06.dump
+++ b/runtime/syntax/testdir/dumps/c_06.dump
@@ -1,9 +1,10 @@
-| +0&#ffffff0@3|/+0#0000e05&|*| +0#0000000&@68
+| +0&#ffffff0@74
+@4|/+0#0000e05&|*| +0#0000000&@68
 | +0#0000e05&@4|*| |D|o| |a|n|y| |s|y|s|t|e|m|-|s|p|e|c|i|f|i|c| |i|n|i|t|i|a|l|i|s|a|t|i|o|n|s|.| @1|T|h|e|s|e| |c|a|n| |N|O|T| |u|s|e| |I|O|b|u|f@1| |o|r
 | @4|*| |N|a|m|e|B|u|f@1|.| @1|T|h|u|s| |e|m|s|g|2|(|)| |c|a|n@1|o|t| |b|e| |c|a|l@1|e|d|!| +0#0000000&@26
 | +0#0000e05&@4|*|/| +0#0000000&@67
-@4|m|c|h|_|e|a|r|l|y|_|i|n|i|t|(|)|;| @53
-> @74
+@4>m|c|h|_|e|a|r|l|y|_|i|n|i|t|(|)|;| @53
+@75
 @4|/+0#0000e05&@1| |S|o|u|r|c|e| |s|t|a|r|t|u|p| |s|c|r|i|p|t|s|.| +0#0000000&@44
 @4|s|o|u|r|c|e|_|s|t|a|r|t|u|p|_|s|c|r|i|p|t|s|(|&|p|a|r|a|m|s|)|;| @38
 @75
@@ -16,5 +17,4 @@
 |#+0#e000e06&|e|l|s|e| +0#0000000&@69
 @4|r+0#af5f00255&|e|t|u|r|n| +0#0000000&|v|i|m|_|m|a|i|n|2|(|)|;| @51
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
-|}| @73
-@57|1|0|9|,|0|-|1| @6|B|o|t| 
+@57|1|0|9|,|5| @8|9@1|%| 
diff --git a/runtime/syntax/testdir/dumps/c_99.dump b/runtime/syntax/testdir/dumps/c_99.dump
index 14b51cd..1af9a49 100644
--- a/runtime/syntax/testdir/dumps/c_99.dump
+++ b/runtime/syntax/testdir/dumps/c_99.dump
@@ -17,4 +17,4 @@
 @4|r+0#af5f00255&|e|t|u|r|n| +0#0000000&|v|i|m|_|m|a|i|n|2|(|)|;| @51
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
 >}| @73
-@57|1|2@1|,|1| @8|B|o|t| 
+@57|1|2|3|,|1| @8|B|o|t| 
diff --git a/runtime/syntax/testdir/dumps/markdown_conceal_00.dump b/runtime/syntax/testdir/dumps/markdown_conceal_00.dump
new file mode 100644
index 0000000..db7ee95
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/markdown_conceal_00.dump
@@ -0,0 +1,20 @@
+>I+4&#ffffff0|t|a|l|i|c|,+0&&| |I+4&&|t|a|l|i|c|.+0&&| @1|B+0#0000001#ffff4012|o|l|d|,+0#0000000#ffffff0| |B+0#0000001#ffff4012|o|l|d|.+0#0000000#ffffff0| @46
+|B+6&&|o|l|d| |I|t|a|l|i|c|,+0&&| |B+6&&|o|l|d| |I|t|a|l|i|c|.+0&&| @49
+|S+1024&&|t|r|i|k|e|t|h|r|o|u|g|h|,+0&&| |S̶|t̶|r̶|i̶|k̶|e̶|t̶|h̶|r̶|o̶|u̶|g̶|h̶|.| @45
+@75
+@75
+|<+0#00e0e07&|p+0#af5f00255&|>+0#00e0e07&| +0#0000000&@71
+|<+0#00e0e07&|d+0#af5f00255&|e|l|>+0#00e0e07&|S+1024#0000000&|t|r|i|k|e|t|h|r|o|u|g|h|<+0#00e0e07&|/|d+0#af5f00255&|e|l|>+0#00e0e07&|,+0#0000000&| |<+0#00e0e07&|s+0#af5f00255&|>+0#00e0e07&|S+1024#0000000&|t|r|i|k|e|t|h|r|o|u|g|h|<+0#00e0e07&|/|s+0#af5f00255&|>+0#00e0e07&|.+0#0000000&|<+0#00e0e07&|b+0#af5f00255&|r| +0#00e0e07&|/|>| +0#0000000&@21
+@75
+@75
+@75
+|<+0#00e0e07&|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|<|e+0#af5f00255&|m|>+0#00e0e07&|B+6#0000000&|o|l|d| |I|t|a|l|i|c|<+0#00e0e07&|/|e+0#af5f00255&|m|>+0#00e0e07&|<|/|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|.+0#0000000&| @36
+|<+0#00e0e07&|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|<|e+0#af5f00255&|m|>+0#00e0e07&|B+6#0000000&|o|l|d| |I|t|a|l|i|c|<+0#00e0e07&|/|e+0#af5f00255&|m|>+0#00e0e07&|<|/|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|.+0#0000000&|<+0#00e0e07&|b+0#af5f00255&|r| +0#00e0e07&|/|>| +0#0000000&@30
+|<+0#00e0e07&|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|B+0#0000001#ffff4012|o|l|d|<+0#00e0e07#ffffff0|/|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|,+0#0000000&| |<+0#00e0e07&|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|B+0#0000001#ffff4012|o|l|d|<+0#00e0e07#ffffff0|/|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|.+0#0000000&| @29
+|<+0#00e0e07&|e+0#af5f00255&|m|>+0#00e0e07&|I+4#0000000&|t|a|l|i|c|<+0#00e0e07&|/|e+0#af5f00255&|m|>+0#00e0e07&|,+0#0000000&| |<+0#00e0e07&|e+0#af5f00255&|m|>+0#00e0e07&|I+4#0000000&|t|a|l|i|c|<+0#00e0e07&|/|e+0#af5f00255&|m|>+0#00e0e07&|.+0#0000000&| @41
+@75
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|,|1| @10|A|l@1| 
diff --git a/runtime/syntax/testdir/dumps/markdown_conceal_99.dump b/runtime/syntax/testdir/dumps/markdown_conceal_99.dump
new file mode 100644
index 0000000..032a7ab
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/markdown_conceal_99.dump
@@ -0,0 +1,20 @@
+|I+4&#ffffff0|t|a|l|i|c|,+0&&| |I+4&&|t|a|l|i|c|.+0&&| @1|B+0#0000001#ffff4012|o|l|d|,+0#0000000#ffffff0| |B+0#0000001#ffff4012|o|l|d|.+0#0000000#ffffff0| @46
+|B+6&&|o|l|d| |I|t|a|l|i|c|,+0&&| |B+6&&|o|l|d| |I|t|a|l|i|c|.+0&&| @49
+|S+1024&&|t|r|i|k|e|t|h|r|o|u|g|h|,+0&&| |S̶|t̶|r̶|i̶|k̶|e̶|t̶|h̶|r̶|o̶|u̶|g̶|h̶|.| @45
+@75
+@75
+|<+0#00e0e07&|p+0#af5f00255&|>+0#00e0e07&| +0#0000000&@71
+|<+0#00e0e07&|d+0#af5f00255&|e|l|>+0#00e0e07&|S+1024#0000000&|t|r|i|k|e|t|h|r|o|u|g|h|<+0#00e0e07&|/|d+0#af5f00255&|e|l|>+0#00e0e07&|,+0#0000000&| |<+0#00e0e07&|s+0#af5f00255&|>+0#00e0e07&|S+1024#0000000&|t|r|i|k|e|t|h|r|o|u|g|h|<+0#00e0e07&|/|s+0#af5f00255&|>+0#00e0e07&|.+0#0000000&|<+0#00e0e07&|b+0#af5f00255&|r| +0#00e0e07&|/|>| +0#0000000&@21
+@75
+@75
+@75
+|<+0#00e0e07&|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|<|e+0#af5f00255&|m|>+0#00e0e07&|B+6#0000000&|o|l|d| |I|t|a|l|i|c|<+0#00e0e07&|/|e+0#af5f00255&|m|>+0#00e0e07&|<|/|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|.+0#0000000&| @36
+|<+0#00e0e07&|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|<|e+0#af5f00255&|m|>+0#00e0e07&|B+6#0000000&|o|l|d| |I|t|a|l|i|c|<+0#00e0e07&|/|e+0#af5f00255&|m|>+0#00e0e07&|<|/|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|.+0#0000000&|<+0#00e0e07&|b+0#af5f00255&|r| +0#00e0e07&|/|>| +0#0000000&@30
+|<+0#00e0e07&|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|B+0#0000001#ffff4012|o|l|d|<+0#00e0e07#ffffff0|/|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|,+0#0000000&| |<+0#00e0e07&|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|B+0#0000001#ffff4012|o|l|d|<+0#00e0e07#ffffff0|/|s+0#af5f00255&|t|r|o|n|g|>+0#00e0e07&|.+0#0000000&| @29
+|<+0#00e0e07&|e+0#af5f00255&|m|>+0#00e0e07&|I+4#0000000&|t|a|l|i|c|<+0#00e0e07&|/|e+0#af5f00255&|m|>+0#00e0e07&|,+0#0000000&| |<+0#00e0e07&|e+0#af5f00255&|m|>+0#00e0e07&|I+4#0000000&|t|a|l|i|c|<+0#00e0e07&|/|e+0#af5f00255&|m|>+0#00e0e07&|.+0#0000000&| @41
+> @74
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|5|,|1| @9|A|l@1| 
diff --git a/runtime/syntax/testdir/input/c.c b/runtime/syntax/testdir/input/c.c
index c96fb33..ede2caf 100644
--- a/runtime/syntax/testdir/input/c.c
+++ b/runtime/syntax/testdir/input/c.c
@@ -1,4 +1,5 @@
 /* vi:set ts=8 sts=4 sw=4 noet:
+ * TEST_SETUP let g:c_comment_strings = 1
  *
  * VIM - Vi IMproved	by Bram Moolenaar
  *
diff --git a/runtime/syntax/testdir/input/markdown_conceal.markdown b/runtime/syntax/testdir/input/markdown_conceal.markdown
new file mode 100644
index 0000000..8049d68
--- /dev/null
+++ b/runtime/syntax/testdir/input/markdown_conceal.markdown
@@ -0,0 +1,15 @@
+_Italic_, *Italic*.  __Bold__, **Bold**.  
+___Bold Italic___, ***Bold Italic***.  
+~~Strikethrough~~, S̶t̶r̶i̶k̶e̶t̶h̶r̶o̶u̶g̶h̶.
+
+~~~html
+<p>
+<del>Strikethrough</del>, <s>Strikethrough</s>.<br />
+~~~
+
+```html
+<strong><em>Bold Italic</em></strong>.
+<strong><em>Bold Italic</em></strong>.<br />
+<strong>Bold</strong>, <strong>Bold</strong>.
+<em>Italic</em>, <em>Italic</em>.
+```
diff --git a/runtime/syntax/testdir/input/setup/markdown_conceal.vim b/runtime/syntax/testdir/input/setup/markdown_conceal.vim
new file mode 100644
index 0000000..a1585b1
--- /dev/null
+++ b/runtime/syntax/testdir/input/setup/markdown_conceal.vim
@@ -0,0 +1,8 @@
+if has('conceal')
+	let g:markdown_syntax_conceal = 1
+	setlocal conceallevel=3 concealcursor=n
+endif
+
+let g:markdown_fenced_languages = ['html']
+highlight link markdownBold Todo
+highlight link htmlBold Todo
diff --git a/runtime/syntax/testdir/runtest.vim b/runtime/syntax/testdir/runtest.vim
index 6d25c4c..4802315 100644
--- a/runtime/syntax/testdir/runtest.vim
+++ b/runtime/syntax/testdir/runtest.vim
@@ -160,8 +160,6 @@
 	  call cursor(1, 1)
 	  " BEGIN [runtime/defaults.vim]
 	  set display=truncate ruler scrolloff=5
-	  " Provide pre-TEST_SETUP support for input/*.c.
-	  let g:c_comment_strings = 1
 	  syntax on
 	  " END [runtime/defaults.vim]
 	  redraw!