Github user paulk-asert commented on a diff in the pull request: https://github.com/apache/groovy/pull/439#discussion_r82519042 --- Diff: src/spec/doc/core-metaprogramming.adoc --- @@ -2868,6 +3015,90 @@ The difference is that when you use `assertScript`, the code in the `assertScrip unit test is executed*. That is to say that this time, the `Subject` class will be compiled with debugging active, and the breakpoint is going to be hit. +===== ASTMatcher + +Sometimes you may want to make assertions over AST nodes whether to filter those nodes, or to make sure a given +transformation has built the expected AST node. + +**Filtering nodes** + +For instance if you would like to apply a given transformation only to a specific set of AST nodes, you could +use **ASTMatcher** to filter these nodes. The following example shows how to transform a given expression to +another. Using **ASTMatcher** it looks for a specific expression `1 + 1` and it transforms it to `3`. That's why +I called it the `@Joking` example. --- End diff -- I => we
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