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Find side-effects of expressions.
||Determine if the call of f, or function type or delegate type t1, has any side effects.|
||Build a temporary variable to copy the value of e into.|
||The result of this expression will be discarded. Print error messages if the operation has no side effects (and hence is meaningless).|
||Build a temporary variable to extract e's evaluation, if e is not trivial.|
||Determine if Expression has any side effects.|
||Front-end expression rewriting should create temporary variables for non trivial sub-expressions in order to: 1. save evaluation order 2. prevent sharing of sub-expression in AST|