Add test for else syntax.

test/corpus/ctrl/else.nu

@@ -0,0 +1,100 @@
+=====
+else-001-block
+=====
+
+if true {} else {}
+
+-----
+
+(nu_script
+ (pipeline
+ (pipe_element
+ (ctrl_if
+ condition: (val_bool)
+ then_branch: (block)
+ else_block: (block)))))
+
+=====
+else-002-command
+=====
+
+if true {} else ls
+
+-----
+
+(nu_script
+ (pipeline
+ (pipe_element
+ (ctrl_if
+ condition: (val_bool)
+ then_branch: (block)
+ else_block: (command
+ head: (cmd_identifier))))))
+
+=====
+else-003-command
+=====
+
+if true {} else ^ls
+
+-----
+
+(nu_script
+ (pipeline
+ (pipe_element
+ (ctrl_if
+ condition: (val_bool)
+ then_branch: (block)
+ else_block: (command
+ head: (cmd_identifier))))))
+
+=====
+else-004-command
+=====
+
+if true {} else ^'ls'
+
+-----
+
+(nu_script
+ (pipeline
+ (pipe_element
+ (ctrl_if
+ condition: (val_bool)
+ then_branch: (block)
+ else_block: (command
+ head: (cmd_identifier))))))
+
+=====
+else-005-command
+=====
+
+if true {} else ^('ls')
+
+-----
+
+(nu_script
+ (pipeline
+ (pipe_element
+ (ctrl_if
+ condition: (val_bool)
+ then_branch: (block)
+ else_block: (command
+ head: (cmd_identifier))))))
+
+=====
+else-006-expression
+=====
+
+if true {} else $expression
+
+-----
+
+(nu_script
+ (pipeline
+ (pipe_element
+ (ctrl_if
+ condition: (val_bool)
+ then_branch: (block)
+ else_block: (val_variable
+ name: (identifier))))))