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Support explicit discriminant numbers on tag variants.

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Addresses issue #1393.

For now disallow disr. values unless all variants use nullary
contractors (i.e. "enum-like").

Disr. values are now encoded in the crate metadata, but only when it
will differ from the inferred value based on the order.
This commit is contained in:
Kevin Atkinson 2012-01-10 14:50:40 -07:00 • committed by Graydon Hoare
parent d0fe6723fc
commit 08abf8d37f
12 changed files with 167 additions and 30 deletions
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3
src/comp/syntax/ast.rs
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@ -416,7 +416,8 @@ type native_mod =
type variant_arg = {ty: @ty, id: node_id};
type variant_ = {name: ident, args: [variant_arg], id: node_id};
type variant_ = {name: ident, args: [variant_arg], id: node_id,
disr_val: int, disr_expr: option::t<@expr>};
type variant = spanned<variant_>;