patch 9.0.1627: no generic mechanism to test syntax plugins
Problem: No generic mechanism to test syntax plugins.
Solution: Add a syntax plugin test mechanism, using screendumps. Add a
simple test for "c".
diff --git a/runtime/syntax/testdir/dumps/c_00.dump b/runtime/syntax/testdir/dumps/c_00.dump
new file mode 100644
index 0000000..d32cbd2
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/c_00.dump
@@ -0,0 +1,20 @@
+>/+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&|*| +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
+| +0#0000e05&|*| |D|o| |"+0#e000002&|:|h|e|l|p| |u|g|a|n|d|a|"| +0#0000e05&@1|i|n| |V|i|m| |t|o| |r|e|a|d| |c|o|p|y|i|n|g| |a|n|d| |u|s|a|g|e| |c|o|n|d|i|t|i|o|n|s|.| +0#0000000&@8
+| +0#0000e05&|*| |D|o| |"+0#e000002&|:|h|e|l|p| |c|r|e|d|i|t|s|"| +0#0000e05&|i|n| |V|i|m| |t|o| |s|e@1| |a| |l|i|s|t| |o|f| |p|e|o|p|l|e| |w|h|o| |c|o|n|t|r|i|b|u|t|e|d|.| +0#0000000&@5
+| +0#0000e05&|*| |S|e@1| |R|E|A|D|M|E|.|t|x|t| |f|o|r| |a|n| |o|v|e|r|v|i|e|w| |o|f| |t|h|e| |V|i|m| |s|o|u|r|c|e| |c|o|d|e|.| +0#0000000&@17
+| +0#0000e05&|*|/| +0#0000000&@71
+@75
+|#+0#e000e06&|d|e|f|i|n|e| |E|X|T|E|R|N| +0#0000000&@60
+|#+0#e000e06&|i|n|c|l|u|d|e| |"+0#e000002&|v|i|m|.|h|"| +0#0000000&@58
+@75
+|#+0#e000e06&|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
+@75
+|"|i|n|p|u|t|/|c|.|c|"| |1|2@1|L|,| |3|1|7|4|B| @33|1|,|1| @10|T|o|p|
diff --git a/runtime/syntax/testdir/dumps/c_01.dump b/runtime/syntax/testdir/dumps/c_01.dump
new file mode 100644
index 0000000..cd6ae05
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/c_01.dump
@@ -0,0 +1,20 @@
+|#+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&| |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&|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
+@75
+|/+0#0000e05&@1| |V|a|l|u|e|s| |f|o|r| |e|d|i|t|_|t|y|p|e|.| +0#0000000&@50
+|#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|N|O|N|E| @2|0+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |n|o| |e|d|i|t| |t|y|p|e| |y|e|t| +0#0000000&@27
+|#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|F|I|L|E| @2|1+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |f|i|l|e| |n|a|m|e| |a|r|g|u|m|e|n|t|[|s|]| |g|i|v|e|n|,| |u|s|e| |a|r|g|u|m|e|n|t| |l|i
+|s|t| +0#0000000&@72
+|#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|S|T|D|I|N| @1|2+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |r|e|a|d| |f|i|l|e| |f|r|o|m| |s|t|d|i|n| +0#0000000&@23
+|#+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|%|
diff --git a/runtime/syntax/testdir/dumps/c_02.dump b/runtime/syntax/testdir/dumps/c_02.dump
new file mode 100644
index 0000000..82820ff
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/c_02.dump
@@ -0,0 +1,20 @@
+|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&|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
+|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
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|r|e|a|d|_|s|t|d|i|n|(|v+0#00e0003&|o|i|d|)+0#0000000&|;| @45
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|c|r|e|a|t|e|_|w|i|n|d|o|w|s|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|)|;| @31
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|e|d|i|t|_|b|u|f@1|e|r|s|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|,| |c|h|a|r|_|u| |*|c|w|d|)|;| @20
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|e|x|e|_|p|r|e|_|c|o|m@1|a|n|d|s|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|)|;| @29
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|e|x|e|_|c|o|m@1|a|n|d|s|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|)|;| @33
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|s|o|u|r|c|e|_|s|t|a|r|t|u|p|_|s|c|r|i|p|t|s|(|m|p|a|r|m|_|T| |*|p|a|r|m|p|)|;| @23
+|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|%|
diff --git a/runtime/syntax/testdir/dumps/c_03.dump b/runtime/syntax/testdir/dumps/c_03.dump
new file mode 100644
index 0000000..5f0e8d8
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/c_03.dump
@@ -0,0 +1,20 @@
+|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&| |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
+| +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
+|{| @73
+@4|N|_|(|"+0#e000002&|U|n|k|n|o|w|n| |o|p|t|i|o|n| |a|r|g|u|m|e|n|t|"|)+0#0000000&|,| @40
+|#+0#e000e06&|d|e|f|i|n|e| |M|E|_|U|N|K|N|O|W|N|_|O|P|T|I|O|N| @6|0+0#e000002&| +0#0000000&@41
+@4|N|_|(|"+0#e000002&|T|o@1| |m|a|n|y| |e|d|i|t| |a|r|g|u|m|e|n|t|s|"|)+0#0000000&|,| @40
+|#+0#e000e06&|d|e|f|i|n|e| |M|E|_|T|O@1|_|M|A|N|Y|_|A|R|G|S| @7|1+0#e000002&| +0#0000000&@41
+@4|N|_|(|"+0#e000002&|A|r|g|u|m|e|n|t| |m|i|s@1|i|n|g| |a|f|t|e|r|"|)+0#0000000&|,| @41
+|#+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|%|
diff --git a/runtime/syntax/testdir/dumps/c_04.dump b/runtime/syntax/testdir/dumps/c_04.dump
new file mode 100644
index 0000000..9864b88
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/c_04.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@3|N|_|(|"+0#e000002&|T|o@1| |m|a|n|y| |\+0#e000e06&|"|++0#e000002&|c|o|m@1|a|n|d|\+0#e000e06&|"|,+0#e000002&| |\+0#e000e06&|"|-+0#e000002&|c| |c|o|m@1|a|n|d|\+0#e000e06&|"| +0#e000002&|o|r| |\+0#e000e06&|"|-+0#e000002&@1|c|m|d| |c|o|m@1|a|n|d|\+0#e000e06&|"| +0#e000002&|a|r|g|u|m|e|n|t
+|s|"|)+0#0000000&|,| @70
+|#+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
+|#+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
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|m|p|a|r|m|_|T| @1|p|a|r|a|m|s|;| @51
+@75
+|#+0#e000e06&|i|f|d|e|f| |_|I|O|L|B|F| +0#0000000&@61
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|*|s|_|v|b|u|f| |=| |N+0#e000002&|U|L@1|;+0#0000000&| @12|/+0#0000e05&@1| |b|u|f@1|e|r| |f|o|r| |s|e|t|v|b|u|f|(|)| +0#0000000&@11
+|#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
+@75
+|#+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|%|
diff --git a/runtime/syntax/testdir/dumps/c_05.dump b/runtime/syntax/testdir/dumps/c_05.dump
new file mode 100644
index 0000000..5b977ea
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/c_05.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@74
+|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
+@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
+|#+0#e000e06&| |e|l|s|e| +0#0000000&@68
+|m|a|i|n| @70
+|#+0#e000e06&| |e|n|d|i|f| +0#0000000&@67
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+|{| @73
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diff --git a/runtime/syntax/testdir/dumps/c_06.dump b/runtime/syntax/testdir/dumps/c_06.dump
new file mode 100644
index 0000000..fd7fe90
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/c_06.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/c_99.dump b/runtime/syntax/testdir/dumps/c_99.dump
new file mode 100644
index 0000000..14b51cd
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/c_99.dump
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