Fix compiler warnings related to Crystal 1.14

manual/model/transactions-and-save-points/connection-pool.md

@@ -12,20 +12,20 @@ begin
     # Clear automatically create a connection nº1 
     Clear::SQL.transaction do
       Clear::SQL.insert("tests", {id: 1}).execute
-      sleep 0.2 #< Wait and do not commit the transaction for now
+      sleep 0.2.seconds # Wait and do not commit the transaction for now
     end
   end
 
   @@count = -1
 
   # Spawn a new fiber
   spawn do
-    sleep 0.1 #Wait a bit, to ensure than the first connection is inside a transaction
+    sleep 0.1.seconds # Wait a bit, to ensure than the first connection is inside a transaction
     # execute in connection nº2
     @@count = Clear::SQL.select.from("tests").count
   end
 
-  sleep 0.3 # Let the 2 fiber time to finish...
+  sleep 0.3.seconds # Let the 2 fiber time to finish...
 
   # The count is zero, because: it has been setup by the second fiber, which
   # called AFTER the insert but BEFORE the commit on the connection nº1

spec/sql/connection_pool_spec.cr

@@ -19,19 +19,19 @@ module ConnectionPoolSpec
           spawn do
             Clear::SQL.transaction do
               Clear::SQL.insert("tests", {id: 1}).execute
-              sleep 0.2 # < The transaction is not yet commited
+              sleep 0.2.seconds # < The transaction is not yet commited
             end
           end
 
           @@count = 0
 
           spawn do
             # Not inside the transaction so count must be zero since the transaction is not finished:
-            sleep 0.1
+            sleep 0.1.seconds
             @@count = Clear::SQL.select.from("tests").count
           end
 
-          sleep 0.3 # Let the 2 spawn finish...
+          sleep 0.3.seconds # Let the 2 spawn finish...
 
           @@count.should eq 0 # < If one, the connection pool got wrong with the fiber.
 

spec/sql/select/lock_spec.cr

@@ -19,7 +19,7 @@ module LockSpec
         Clear::SQL.select.from(:to_lock).pluck_col(:id).should eq [1]
       end
 
-      sleep(0.05) # Give hand to the other fiber. Now it should be not locked anymore?
+      sleep 0.05.seconds # Give hand to the other fiber. Now it should be not locked anymore?
       Clear::SQL.select.from(:to_lock).order_by("id", :asc).pluck_col(:id).should eq [1, 2]
     ensure
       Clear::SQL.execute("DROP TABLE to_lock")

src/clear/expression/expression.cr

@@ -83,7 +83,7 @@ class Clear::Expression
       @value
     end
 
-    def to_json(b = nil)
+    def to_json(x = nil)
       @value
     end
   end