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Question: Why did Maple miss the multiplication symbol but not report an error?

Question: Why did Maple miss the multiplication symbol but not report an error?

lcz 994 Maple 2020
multiplication syntax
June 22 2020
1

Theoretically, if the multiplication sign  is missed Maple needs to give reminders or warnings.But the following is not the case, why？I am surprised its output. 

x:=1
                             x := 1
x(2+1)# Actually, I want to enter x*(2+1)

                               1
x(sin(y))# Actually, I want to enter x*(sin(y))
                               1
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