d8076b9333
Surface rename of the signed integer family: s1..s64 become i1..i64
(u1..u64, usize, isize unchanged). 'string' keeps the s-prefix arm in
name classification; width parsing moves to the i-prefix arm next to
isize.
Internal TypeId tags follow the surface (.s8/.s16/.s32/.s64 ->
.i8/.i16/.i32/.i64), as do mono-key mangle fragments (ptr_i64,
tu_i64_bool) and all display/diagnostic formatting (i{d}).
Migrated in the same sweep: stdlib + examples + issue repros + FFI C
companions (shared symbol names like ffi_id_i64), expected
stdout/stderr/ir snapshots, specs.md, readme.md, CLAUDE.md/AGENTS.md,
implementation_plan.md, docs/, issue writeups. Vendored stb_image and
historical flow state left untouched.
zig build test: 426/426; examples suite: 595/595.
41 lines
1.3 KiB
Plaintext
41 lines
1.3 KiB
Plaintext
// Whole-program inferred error sets (ERR step E1.4b). A bare `-> !` function's
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// error set is INFERRED: the union of the tags it raises directly plus the
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// sets of the failable functions it `try`s, converged across the whole call
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// graph by a fix-point pass. Here `leaf` raises {Foo}; `mid` try-propagates
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// leaf AND raises Bar, so `mid` converges to {Foo, Bar}; the named caller
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// `run :: -> !A` then type-checks because mid's converged set is a subset of
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// A. The rejection (a converged tag NOT in the caller's set) lives in
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// `examples/224-inferred-widening-reject.sx`.
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#import "modules/std.sx";
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A :: error { Foo, Bar }
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leaf :: (n: i32) -> ! {
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if n < 0 { raise error.Foo; }
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return;
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}
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// Inferred set converges to {Foo, Bar}: {Foo} absorbed from `try leaf` plus
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// the directly-raised Bar.
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mid :: (n: i32) -> ! {
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try leaf(n);
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if n == 100 { raise error.Bar; }
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return;
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}
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// Named caller: mid's converged {Foo, Bar} is a subset of A -> widening OK.
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run :: (n: i32) -> !A {
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try mid(n);
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return;
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}
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main :: () -> i32 {
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e := run(-1); // leaf raises Foo -> propagates out
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r : i32 = 0;
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if e == error.Foo { r = r + 7; } // true -> +7
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if e == error.Bar { r = r + 1; } // false (Foo escaped, not Bar)
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print("inferred result: {}\n", r); // -> 7
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return r;
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}
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