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  1. main = do
  2.          foldl ( \ a b -> 2*a + b) 0 [1,0,0,1,0]
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 


			

					
			
			

				
	
		
	
	
		 compilation info
		
	
	
[1 of 1] Compiling Main             ( prog.hs, prog.o )

prog.hs:2:26:
    No instance for (Num (IO t))
      arising from the literal `2' at prog.hs:2:26
    Possible fix: add an instance declaration for (Num (IO t))
    In the first argument of `(*)', namely `2'
    In the first argument of `(+)', namely `2 * a'
    In the expression: 2 * a + b


		
		
	
		
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Standard output is empty

	

		
	 
	
	
			

					
			
			
			
			
			
			
			
			

			
			
			
		

	
		
		

			


			                        
			
			

				

	
					
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language:

						
Haskell (ghc 8.4.4)

					

					

						
created:
								
						
14 years ago

					

					

						
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