runtime(haskell): Add syntax test

Add a test for issue #18776 (allow spaces in backticked operators).

closes: #18783

Signed-off-by: Doug Kearns <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>

Author: dkearns

runtime/syntax/testdir/dumps/haskell_00.dump

@@ -0,0 +1,20 @@
+>-+0#0000e05#ffffff0@1| |I|s@1|u|e| |#|1|8|7@1|6| |(|a|l@1|o|w| |s|p|a|c|e|s| |i|n| |b|a|c|k|t|i|c|k|e|d| |o|p|e|r|a|t|o|r|s|)| +0#0000000&@20
+@75
+|m|a|i|n| |=+0#af5f00255&| +0#0000000&|p|r|i|n|t| |(|9+0#e000002&| +0#0000000&|`+0#af5f00255&| |d|i|v| |`| +0#0000000&|4+0#e000002&|)+0#0000000&| @48
+@75
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|,|1| @10|A|l@1| 

runtime/syntax/testdir/input/haskell.hs

@@ -0,0 +1,4 @@
+-- Issue #18776 (allow spaces in backticked operators)
+
+main = print (9 ` div ` 4)
+