[PATCH 14/17] widl: Check that expressions resolve so that expressions in generated code will compile.

[Robert Shearman]

Also check that expressions return the correct type for the attribute.
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  tools/widl/parser.y |  361 
++++++++++++++++++++++++++++++++++++++++++++++++++-
  1 files changed, 357 insertions(+), 4 deletions(-)
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