checker: handle unexpected `or` blocks

vlib/v/builder/cc.v

@@ -7,7 +7,6 @@ import os
 import time
 import v.cflag
 import v.pref
-import v.util
 import term
 
 const (

vlib/v/checker/checker.v

@@ -935,6 +935,9 @@ pub fn (mut c Checker) check_expr_opt_call(x ast.Expr, xtype table.Type, is_retu
 		ast.CallExpr {
 			if it.return_type.flag_is(.optional) {
 				c.check_or_block(it, xtype, is_return_used)
+			} else if it.or_block.is_used {
+				c.error('unexpected `or` block, the function does not return an optional',
+					it.pos)
 			}
 		}
 		else {}

vlib/v/parser/fn.v

@@ -61,9 +61,8 @@ pub fn (mut p Parser) call_expr(is_c, is_js bool, mod string) ast.CallExpr {
 		// `foo()?`
 		p.next()
 		is_or_block_used = true
-		//mut s := ast.Stmt{}
+		// mut s := ast.Stmt{}
-		//s = ast.ReturnStmt{}
+		// s = ast.ReturnStmt{}
-
 		or_stmts << ast.Return{}
 	}
 	node := ast.CallExpr{