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Clutch modification to tree printing.
Don't print trees under -Xprint:all if they're identical to the tree printed at the previous phase. It only works for a single compilation unit but that is a huge step forward for us debuggers. For instance this file: trait Foo { def f = 5 } used to produce 332 lines of output and now produces 92, with zero loss of information. It ends with: [[syntax trees at end of cleanup]] // a.scala: tree is unchanged since mixin [[syntax trees at end of icode]] // a.scala: tree is unchanged since mixin [[syntax trees at end of inliner]] // a.scala: tree is unchanged since mixin [[syntax trees at end of inlineExceptionHandlers]] // a.scala: tree is unchanged since mixin [[syntax trees at end of closelim]] // a.scala: tree is unchanged since mixin [[syntax trees at end of dce]] // a.scala: tree is unchanged since mixin [[syntax trees at end of jvm]] // a.scala: tree is unchanged since mixin
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