Show node ID when printing the trace.
Better tree construction.

When a rule defines multiple ID, the tree used the first one instead of
the last one (present in the trace). This is now fixed and it behaves as
expected.
[auto] Merge from Compiler

    • #393dafa — Show node ID when printing the trace. (Ivan Enderlin, 2013-08-21)
    • #0926c03 — Better tree construction. (Ivan Enderlin, 2013-08-21)

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Merge remote branch 'library-compiler/master'