turtle.detectUp

When called, will return true if the block above the turtle is anything that is not air or liquid.

ExampleDetecting blocks
Detect if there is a block above the turtle.
Code 
local result = turtle.detectUp()
if result then
  print("There is a block above the turtle!")
else
  print("There is no block above the turtle, only air or a liquid.")
end
Output 
There is a block above the turtle!

turtle.detectUp
Function
Syntax
turtle.detectUp()
Returns boolean result
API turtle
Source CC:Tweaked (source)
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