diff --git a/runtime/syntax/testdir/dumps/yaml_01.dump b/runtime/syntax/testdir/dumps/yaml_01.dump
index ae84e98e38..bbef58c78b 100644
--- a/runtime/syntax/testdir/dumps/yaml_01.dump
+++ b/runtime/syntax/testdir/dumps/yaml_01.dump
@@ -11,10 +11,10 @@
 @75
 |p+0#00e0e07&|l|a|i|n| |s|t|r|i|n|g|s|:+0#e000e06&| +0#0000000&@60
 @2|-+0#af5f00255&| +0#0000000&|a| |b| |c| @65
-@2|-+0#af5f00255&| +0#0000000&|a| |*| |b| |&| |c| |@| |d|#| |e| |:| |f| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@40
+@2|-+0#af5f00255&| +0#0000000&|a|:|b| |&| |c| |@| |d|#| |e| |*| |f| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@42
 @2|-+0#af5f00255&| +0#0000000&|{@1| |f|(|'| |'|)| |}@1| +0#0000e05&|#|8|2|3|4| +0#0000000&@52
 |d+0#00e0e07&|o|u|b|l|e| |q|u|o|t|e|d| |s|t|r|i|n|g|s|:+0#e000e06&| +0#0000000&@52
 @2|-+0#af5f00255&| +0#0000000&|"+0#e000002&@1| +0#0000000&@68
 @2|-+0#af5f00255&| +0#0000000&|"+0#e000002&|a| |b| |c|"|:+0#e000e06&| +0#0000000&|"+0#e000002&|d| |e| |f|"| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@44
 @2|-+0#af5f00255&| +0#0000000&|"+0#e000002&|\+0#e000e06&@2|"|\|a|\|b|\|f|\|n|\|r|\|t|\|v|\|0|\|_|\| |\|N|\|L|\|P|\|x|4|1|\|u|0@1|4|1|\|U|0@5|4|1|"+0#e000002&| +0#0000000&@18
-@57|1|9|,|1| @9|1|2|%| 
+@57|1|9|,|1| @9|1@1|%| 
diff --git a/runtime/syntax/testdir/dumps/yaml_03.dump b/runtime/syntax/testdir/dumps/yaml_03.dump
index 4d1466ed6d..2ca0df064f 100644
--- a/runtime/syntax/testdir/dumps/yaml_03.dump
+++ b/runtime/syntax/testdir/dumps/yaml_03.dump
@@ -17,4 +17,4 @@
 @5|b|a|r|:| |1| @63
 @2|-+0#af5f00255&| +0#0000000&|b+0#00e0e07&|l|o|c|k| |l|i|t|e|r|a|l| |s|t|r|i|n|g|:+0#e000e06&| +0#0000000&||+0#e000e06&|1|-| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@35
 @5|f|o@1| @66
-@57|5@1|,|7| @9|4|5|%| 
+@57|5@1|,|7| @9|4@1|%| 
diff --git a/runtime/syntax/testdir/dumps/yaml_04.dump b/runtime/syntax/testdir/dumps/yaml_04.dump
index 25034709f7..3eda526f75 100644
--- a/runtime/syntax/testdir/dumps/yaml_04.dump
+++ b/runtime/syntax/testdir/dumps/yaml_04.dump
@@ -17,4 +17,4 @@
 | +0#e000002&@3|f|o@1| +0#0000000&@67
 | +0#e000002&@3|b|a|r| +0#0000000&@67
 | +0#e000002&@3|b|a|z|"| +0#0000000&@66
-@57|7|3|,|0|-|1| @7|6|2|%| 
+@57|7|3|,|0|-|1| @7|6|1|%| 
diff --git a/runtime/syntax/testdir/dumps/yaml_05.dump b/runtime/syntax/testdir/dumps/yaml_05.dump
index d64c48b61f..570bdc080a 100644
--- a/runtime/syntax/testdir/dumps/yaml_05.dump
+++ b/runtime/syntax/testdir/dumps/yaml_05.dump
@@ -6,9 +6,10 @@
 @2>i+0#00e0e07&|n|s|i|d|e| |b|l|o|c|k| |m|a|p@1|i|n|g|:+0#e000e06&| +0#0000000&@51
 @4|f+0#00e0e07&|o@1|:+0#e000e06&| +0#0000000&|{+0#e000e06&|b+0#00e0e07&|a|r|:+0#e000e06&| +0#0000000&|b|a|z|}+0#e000e06&| +0#0000000&@55
 @4|b+0#00e0e07&|a|r|:+0#e000e06&| +0#0000000&|[+0#e000e06&|"+0#e000002&|f|o@1|"|:+0#e000e06&| +0#0000000&|{+0#e000e06&|b+0#00e0e07&|a|z|:+0#e000e06&| +0#0000000&|q|u|x|}+0#e000e06&|]| +0#0000000&@46
-@2|f+0#00e0e07&|l|o|w| |c|o|l@1|e|c|t|i|o|n|:+0#e000e06&| +0#0000000&|[+0#e000e06&|f+0#0000000&|o@1| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@41
+@2|f+0#00e0e07&|l|o|w|:|c|o|l@1|e|c|t|i|o|n|:+0#e000e06&| +0#0000000&|[+0#e000e06&|f+0#0000000&|o@1| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@41
 @4|,| |{+0#e000e06&|b+0#00e0e07&|a|r|:+0#e000e06&| +0#0000000&|[+0#e000e06&|{| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@50
-@6|b+0#00e0e07&|a|z|:+0#e000e06&| +0#0000000&|'+0#e000002&| +0#0000000&@62
+@6|b+0#00e0e07&|a|z|:+0#e000e06&| +0#0000000&@64
+@6|'+0#e000002&| +0#0000000&@67
 | +0#e000002&@7|q|u|x| |#| |n|o|t| |c|o|m@1|e|n|t| +0#0000000&@49
 | +0#e000002&@5|'| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@57
 @4|}+0#e000e06&|]|}|]| +0#0000000&@66
@@ -16,5 +17,4 @@
 |e+0#00e0e07&|x|p|l|i|c|i|t| |m|a|p@1|i|n|g|:+0#e000e06&| +0#0000000&@57
 @2|?+0#e000e06&| +0#0000000&|f|o@1| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@57
 @2|:+0#e000e06&| +0#0000000&|b|a|r| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@57
-@2|?+0#e000e06&| +0#0000000&|-+0#af5f00255&| +0#0000000&|f|o@1| @65
-@57|9|1|,|3| @9|7|8|%| 
+@57|9|1|,|3| @9|7@1|%| 
diff --git a/runtime/syntax/testdir/dumps/yaml_06.dump b/runtime/syntax/testdir/dumps/yaml_06.dump
index f6c83c2c38..30ea7ff15a 100644
--- a/runtime/syntax/testdir/dumps/yaml_06.dump
+++ b/runtime/syntax/testdir/dumps/yaml_06.dump
@@ -1,20 +1,20 @@
-| +0&#ffffff0@1|?+0#e000e06&| +0#0000000&|-+0#af5f00255&| +0#0000000&|f|o@1| @65
+| +0&#ffffff0@1|:+0#e000e06&| +0#0000000&|b|a|r| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@57
+@2|?+0#e000e06&| +0#0000000&|-+0#af5f00255&| +0#0000000&|f|o@1| @65
 @4|-+0#af5f00255&| +0#0000000&|b|a|r| @65
 @2|:+0#e000e06&| +0#0000000&|-+0#af5f00255&| +0#0000000&|b|a|z| @65
 @4|-+0#af5f00255&| +0#0000000&|q|u|x| @65
-@2|?+0#e000e06&| +0#0000000&|[+0#e000e06&|1+0#e000002&|,+0#0000000&| |2+0#e000002&|,+0#0000000&| |3+0#e000002&|]+0#e000e06&| +0#0000000&@61
-@2>:+0#e000e06&| +0#0000000&|?+0#e000e06&| +0#0000000&|1+0#e000002&| +0#0000000&@67
+@2>?+0#e000e06&| +0#0000000&|[+0#e000e06&|1+0#e000002&|,+0#0000000&| |2+0#e000002&|,+0#0000000&| |3+0#e000002&|]+0#e000e06&| +0#0000000&@61
+@2|:+0#e000e06&| +0#0000000&|?+0#e000e06&| +0#0000000&|1+0#e000002&| +0#0000000&@67
 @4|:+0#e000e06&| +0#0000000&|o|n|e| @65
 @4|?+0#e000e06&| +0#0000000&|2+0#e000002&| +0#0000000&@67
 @4|:+0#e000e06&| +0#0000000&|-+0#af5f00255&| +0#0000000&|?+0#e000e06&| +0#0000000&|3+0#e000002&| +0#0000000&@63
 @8|:+0#e000e06&| +0#0000000&|t|h|r|e@1| @59
 @6|-+0#af5f00255&| +0#0000000&|{+0#e000e06&|?|4+0#00e0e07&|:+0#e000e06&| +0#0000000&|f|o|u|r|,| |?+0#e000e06&| +0#0000000&|5+0#00e0e07&|:+0#e000e06&| +0#0000000&|f|i|v|e|,| |?+0#e000e06&| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@33
 @8|6+0#00e0e07&|:+0#e000e06&| +0#0000e05&|#| |c|o|m@1|e|n|t| +0#0000000&@54
-@8|{+0#e000e06&|7+0#00e0e07&|:+0#e000e06&|s+0#0000000&|e|v|e|n|}+0#e000e06&@1| +0#0000000&@56
+@8|{+0#e000e06&|7+0#0000000&|:|s|e|v|e|n|}+0#e000e06&@1| +0#0000000&@56
 @75
 |m+0#00e0e07&|a|p@1|i|n|g| |m|e|r|g|e|:+0#e000e06&| +0#0000000&@60
 @2|f+0#00e0e07&|o@1|:+0#e000e06&| +0#0000000&|&+0#00e0003&|f|o@1| +0#0000000&@63
 @4|b+0#00e0e07&|a|r|:+0#e000e06&| +0#0000000&|b|a|z| @62
 @2|b+0#00e0e07&|a|r|:+0#e000e06&| +0#0000000&@68
-@4|<+0#e000e06&@1|:| +0#0000000&|*+0#00e0003&|f|o@1| +0#0000000&@62
-@57|1|0|9|,|3| @8|9|5|%| 
+@57|1|0|9|,|3| @8|9|4|%| 
diff --git a/runtime/syntax/testdir/dumps/yaml_07.dump b/runtime/syntax/testdir/dumps/yaml_07.dump
index ce0d1664d6..ff6d9a2449 100644
--- a/runtime/syntax/testdir/dumps/yaml_07.dump
+++ b/runtime/syntax/testdir/dumps/yaml_07.dump
@@ -1,9 +1,10 @@
-| +0&#ffffff0@3|<+0#e000e06&@1|:| +0#0000000&|*+0#00e0003&|f|o@1| +0#0000000&@62
+| +0&#ffffff0@1|b+0#00e0e07&|a|r|:+0#e000e06&| +0#0000000&@68
+@4|<+0#e000e06&@1|:| +0#0000000&|*+0#00e0003&|f|o@1| +0#0000000&@62
 @4|b+0#00e0e07&|a|z|:+0#e000e06&| +0#0000000&|&+0#00e0003&|b|a|r| +0#0000000&@61
 @6|f+0#00e0e07&|o@1|:+0#e000e06&| +0#0000000&|[+0#e000e06&|*+0#00e0003&|f|o@1|]+0#e000e06&| +0#0000000&@57
 @4|q+0#00e0e07&|u|x|:+0#e000e06&| +0#0000000&@66
-@6|<+0#e000e06&@1|:| +0#0000000&|[+0#e000e06&|*+0#00e0003&|f|o@1|,+0#0000000&| |*+0#00e0003&|b|a|r|]+0#e000e06&| +0#0000000&@52
-@2>b+0#00e0e07&|a|z|:+0#e000e06&| +0#0000000&|{+0#e000e06&|<@1|:| +0#0000000&|*+0#00e0003&|f|o@1|,+0#0000000&| |q+0#00e0e07&|u|x|:+0#e000e06&| +0#0000000&|[+0#e000e06&|{|<@1| +0#0000000&|:+0#e000e06&| +0#0000000&|*+0#00e0003&|f|o@1|}+0#e000e06&|]|}| +0#0000000&@37
+@6><+0#e000e06&@1|:| +0#0000000&|[+0#e000e06&|*+0#00e0003&|f|o@1|,+0#0000000&| |*+0#00e0003&|b|a|r|]+0#e000e06&| +0#0000000&@52
+@2|b+0#00e0e07&|a|z|:+0#e000e06&| +0#0000000&|{+0#e000e06&|<@1|:| +0#0000000&|*+0#00e0003&|f|o@1|,+0#0000000&| |q+0#00e0e07&|u|x|:+0#e000e06&| +0#0000000&|[+0#e000e06&|{|<@1| +0#0000000&|:+0#e000e06&| +0#0000000&|*+0#00e0003&|f|o@1|}+0#e000e06&|]|}| +0#0000000&@37
 |~+0#4040ff13&| @73
 |~| @73
 |~| @73
@@ -16,5 +17,4 @@
 |~| @73
 |~| @73
 |~| @73
-|~| @73
-| +0#0000000&@56|1|2|7|,|3| @8|B|o|t| 
+| +0#0000000&@56|1|2|7|,|7| @8|B|o|t| 
diff --git a/runtime/syntax/testdir/input/yaml.yaml b/runtime/syntax/testdir/input/yaml.yaml
index d87aca2113..72e0a0dd4f 100644
--- a/runtime/syntax/testdir/input/yaml.yaml
+++ b/runtime/syntax/testdir/input/yaml.yaml
@@ -24,7 +24,7 @@ not a number: [.nan, .NaN, .NAN]
 
 plain strings:
   - a b c
-  - a * b & c @ d# e : f # comment
+  - a:b & c @ d# e * f # comment
   - {{ f(' ') }} #8234
 double quoted strings:
   - ""
@@ -91,9 +91,10 @@ flow collection:
   inside block mapping:
     foo: {bar: baz}
     bar: ["foo": {baz: qux}]
-  flow collection: [foo # comment
+  flow:collection: [foo # comment
     , {bar: [{ # comment
-      baz: '
+      baz:
+      '
         qux # not comment
       ' # comment
     }]}]
diff --git a/runtime/syntax/yaml.vim b/runtime/syntax/yaml.vim
index 6ec806a4cb..e992bc02e6 100644
--- a/runtime/syntax/yaml.vim
+++ b/runtime/syntax/yaml.vim
@@ -129,7 +129,7 @@ syn region yamlFlowCollection matchgroup=yamlFlowIndicator start='\[' end='\]' c
 execute 'syn match yamlPlainScalar /'.s:ns_plain_out.'/'
 execute 'syn match yamlPlainScalar contained /'.s:ns_plain_in.'/'
 
-execute 'syn match yamlFlowMappingKey /'.s:ns_plain_in.'\%(\s\+'.s:ns_plain_in.'\)*\ze\s*:/ contained '.
+execute 'syn match yamlFlowMappingKey /'.s:ns_plain_in.'\%(\s\+'.s:ns_plain_in.'\)*\ze\s*:\%(\s\|$\)/ contained '.
             \'nextgroup=yamlFlowMappingDelimiter skipwhite'
 syn match yamlFlowMappingKeyStart      /?/ contained nextgroup=@yamlFlowNode skipwhite
 syn match yamlFlowMappingMerge /<<\ze\s*:/ contained nextgroup=yamlFlowMappingDelimiter skipwhite