[Mesa-dev] glsl: strange looking code in ast_function.cpp

[Paul Berry]

On 17 August 2011 08:55, Ian Romanick <idr at freedesktop.org> wrote:
> first.  Recall that, with the exception of the ir_variable in a
> dereference, each node can only appear in the IR stream once.

IMHO, this is the key subtlety that should be mentioned in the comment.