fix: else clause on new line (#678)

Author: ospencer

compiler/src/parsing/parser.dyp

@@ -417,7 +417,7 @@ let_expr :
   | attributes LET MUT value_binds { Exp.let_ ~loc:(symbol_rloc dyp) ~attributes:$1 Nonrecursive Mutable $4 }
 
 if_expr :
-  | IF lparen expr rparen eols? block_or_expr ELSE eols? block_or_expr { Exp.if_ ~loc:(symbol_rloc dyp) $3 $6 $9 }
+  | IF lparen expr rparen eols? block_or_expr eols? ELSE eols? block_or_expr { Exp.if_ ~loc:(symbol_rloc dyp) $3 $6 $10 }
 
 one_sided_if_expr :
   | IF lparen expr rparen eols? block_or_expr { Exp.if_ ~loc:(symbol_rloc dyp) $3 $6 (Exp.block []) }

compiler/test/test_end_to_end.re

@@ -372,6 +372,8 @@ let basic_functionality_tests = [
     "let foo = (if (false) { 5; }); let bar = foo + 5; bar",
     "has type Void but",
   ),
+  t("if_newline_else1", "if (true) 5\nelse 6", "5"),
+  t("if_newline_else2", "if (true) { 5 }\nelse { 6 }", "5"),
   t("int32_1", "42l", "42"),
   t("int64_1", "99999999999999999L", "99999999999999999"),
   t("int64_pun_1", "9999999 * 99999999", "999999890000001"),