allow curly brace on next line also after subroutine and when

docs/source/todo.rst

@@ -1,6 +1,9 @@
 TODO
 ====
 
+- also allow this?
+        if variable { txt.print("yes") }
+        else { txt.print("no") }
 - is it possible to allow the curly brace to be on the next line instead of requiring it to follow on the same line?
 
 ...

examples/test.p8

@@ -1,28 +1,24 @@
 %import textio
-%option no_sysinit
-%zeropage dontuse
+%zeropage basicsafe
 
 main {
 
-    uword variable=55555
+    sub start()
+    {
+        ubyte variable=55
+        when variable
+        {
+            33 -> txt.print("33")
+        }
 
-    sub start() {
-        txt.print("active rambank=")
-        txt.print_ub(cx16.getrambank())
-        txt.print("\nvar addr=")
-        txt.print_uwhex(&variable, true)
-        txt.print("\nvalue=")
-        txt.print_uw(variable)
-        txt.print("\n(rambank 10) variable=")
-        cx16.rambank(10)
-        txt.print_uw(variable)
-        txt.print("\n(rambank 2) variable=")
-        cx16.rambank(2)
-        txt.print_uw(variable)
-        txt.print("\n(rambank 1) variable=")
-        cx16.rambank(1)
-        txt.print_uw(variable)
-        txt.nl()
+        if variable
+        {
+            txt.print("yes")
+        }
+        else
+        {
+            txt.print("no")
+        }
     }
 }
 

parser/antlr/Prog8ANTLR.g4

@@ -239,7 +239,7 @@ inlineir: '%ir' INLINEASMBLOCK;
 inline: 'inline';
 
 subroutine :
-	'sub' identifier '(' sub_params? ')' sub_return_part?  (statement_block EOL)
+	'sub' identifier '(' sub_params? ')' sub_return_part? EOL? (statement_block EOL)
 	;
 
 sub_return_part : '->' datatype  ;
@@ -296,6 +296,6 @@ repeatloop:  'repeat' expression? EOL? (statement | statement_block) ;
 
 unrollloop:  'unroll' integerliteral? EOL? (statement | statement_block) ;
 
-whenstmt: 'when' expression '{' EOL (when_choice | EOL) * '}' EOL? ;
+whenstmt: 'when' expression EOL? '{' EOL (when_choice | EOL) * '}' EOL? ;
 
 when_choice:  (expression_list | 'else' ) '->' (statement | statement_block ) ;