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Auto merge of #45758 - nzig:explain-span-ctxt, r=petrochenkov 

Add comment explaining the ctxt field in Span

As discussed in #45747.

r? @petrochenkov
This commit is contained in:
bors 2017-11-06 05:16:15 +00:00
parent 11cee74093 0220600a0d
commit 54bbd56715
1 changed files with 5 additions and 3 deletions
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8
src/libsyntax_pos/span_encoding.rs
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@ -59,9 +59,11 @@ const LEN_INDEX: usize = 1;
const CTXT_INDEX: usize = 2;
// Tag = 0, inline format.
// -----------------------------------
// | base 31:8 | len 7:1 | tag 0:0 |
// -----------------------------------
// -------------------------------------------------------------
// | base 31:8 | len 7:1 | ctxt (currently 0 bits) | tag 0:0 |
// -------------------------------------------------------------
// Since there are zero bits for ctxt, only SpanData with a 0 SyntaxContext
// can be inline.
const INLINE_SIZES: [u32; 3] = [24, 7, 0];
const INLINE_OFFSETS: [u32; 3] = [8, 1, 1];