# patterns

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This module implements the pattern matching features for term rewriting macro support.

# Imports

ast, types, semdata, sigmatch, idents, aliases, parampatterns, trees

# Procs

    proc sameTrees(a, b: PNode): bool {...}{.raises: [Exception], tags: [RootEffect].}

  Source Edit

    proc applyRule(c: PContext; s: PSym; n: PNode): PNode {...}{.
        raises: [Exception, ERecoverableError, ValueError, IOError],
        tags: [RootEffect, WriteIOEffect, ReadIOEffect, ReadEnvEffect].}

  returns a tree to semcheck if the rule triggered; nil otherwise Source Edit