Choose
Buffers > Compile
or click 
in the toolbar to compile all the code in the current buffer.
Choose Expression > Compile Region to compile the Lisp code in the current region.
Choose
Definitions > Compile
or click 
in the toolbar to compile the current definition.
During compilation, the Editor tool temporarily displays compiler output in the Output tab. Once compilation has finished, you can press
Space
to display the current buffer once again.
Additionally, if any conditions were signalled during the compilation, you can view these in the Compilation Conditions Browser by pressing
Return
. You can also locate the source code that generated a message via the context menu, as described in Interactive compilation messages.
You can review the output at any time by clicking the Output tab of the Editor.