Type of '<variablename>' cannot be inferred from an expression containing '<variablename>'

The compiler cannot infer the data type of a variable if the variable is used in establishing its initial value in the declaration.

For example, with Option Infer set to On, the following examples do not compile:

• Declarations

  ' Does not compile with Option Infer on.  
  Dim m = m  
  Dim d = someFunction(d)  
  

• For loop

  ' Does not compile with Option Infer on.  
  For j = 1 To j  
  Next  
  

• For Each loop

  ' Does not compile with Option Infer on.  
  For Each customer In customer.Orders  
  Next  
  

Error ID: BC30980

To correct this error

• If the two variables were intended to refer to different values, change the name of the variable that you are declaring.

• Use a literal value instead of the variable name in the initial value, on the right side of the assignment.

• Use an As clause to specify the type of the variable you are declaring.

See also

• Dim Statement
• For Each...Next Statement
• For...Next Statement
• Local Type Inference
• Option Infer Statement