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lang: slice ranges take the same bound markers as for-header ranges

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xs[1..=3] (end inclusive), xs[0<..<4] (both exclusive), xs[..=2]
(prefix form with markers, implicit 0 start), xs[2<..] (open end,
exclusive start), and xs[..] (whole collection) — lowered as lo+1 /
hi+1 on the existing subslice op. Strings slice through the same path.
An explicit end marker requires an end expression, matching the
for-header rule.

Regression: examples/0052-basic-slice-range-bounds.sx.
This commit is contained in:
agra
2026-06-10 22:12:45 +03:00
parent f513c11ea6
commit fea5617e4e
9 changed files with 93 additions and 11 deletions
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6
src/ir/lower/expr.zig
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@@ -1207,8 +1207,10 @@ pub fn lowerIndexExpr(self: *Lowering, ie: *const ast.IndexExpr) Ref {
pub fn lowerSliceExpr(self: *Lowering, se: *const ast.SliceExpr) Ref {
const obj = self.lowerExpr(se.object);
const lo = if (se.start) |s| self.lowerExpr(s) else self.builder.constInt(0, .s64);
const hi = if (se.end) |e| self.lowerExpr(e) else self.builder.emit(.{ .length = .{ .operand = obj } }, .s64);
var lo = if (se.start) |s| self.lowerExpr(s) else self.builder.constInt(0, .s64);
if (se.start_exclusive) lo = self.builder.add(lo, self.builder.constInt(1, .s64), .s64);
var hi = if (se.end) |e| self.lowerExpr(e) else self.builder.emit(.{ .length = .{ .operand = obj } }, .s64);
if (se.end_inclusive) hi = self.builder.add(hi, self.builder.constInt(1, .s64), .s64);
// Infer result slice type from the object
const obj_ty = self.inferExprType(se.object);
// Subslice of string stays string (same {ptr, i64} layout, correct type category)