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reword HIR intro. Fix #116

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Mark Mansi 2018-05-08 12:40:43 -05:00 committed by Who? Me?!
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# The HIR # The HIR
The HIR – "High-level IR" – is the primary IR used in most of rustc. The HIR – "High-level IR" – is the primary IR used in most of rustc. It is a
It is a desugared version of the "abstract syntax tree" (AST) that is generated compiler-friendly representation of the abstract syntax tree (AST) that is
after parsing, macro expansion, and name resolution have completed. Many parts generated after parsing, macro expansion, and name resolution have completed.
of HIR resemble Rust surface syntax quite closely, with the exception that some Many parts of HIR resemble Rust surface syntax quite closely, with the
of Rust's expression forms have been desugared away (as an example, `for` loops exception that some of Rust's expression forms have been desugared away. For
are converted into a `loop` and do not appear in the HIR). example, `for` loops are converted into a `loop` and do not appear in the HIR.
This makes HIR more amenable to analysis than a normal AST.
This chapter covers the main concepts of the HIR. This chapter covers the main concepts of the HIR.