3816bfff47
A block-local type is visible only within the source that declares it. The
global `local_type_names` set was source-insensitive, so an imported generic
template's field (resolved in the template's source context, attempt-4) could
bind a type the CALLER declared block-local — silently compiling an undeclared
imported field instead of diagnosing it.
Key `local_type_names` by declaring source. The bare-TYPE gate now resolves a
local only when the query originates in the local's own source (R2 preserved);
a same-name block-local of a DIFFERENT source routes to the undeclared path so
the leak surfaces (`unknown type '...'`, exit 1) instead of escaping via the
`registered` catch-all that would otherwise resolve the globally-registered
cross-source local.
Regression: examples/0762 — imported `Bad :: struct($T) { x: T; y: LocalOnly; }`
with `LocalOnly` declared only in the caller `main` now errors in lib.sx
(fail-before on 8162170 printed `1 9` exit 0).
26 lines
1.2 KiB
Plaintext
26 lines
1.2 KiB
Plaintext
// An IMPORTED generic template's field that names a type the CALLER declared
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// only as a BLOCK-LOCAL must NOT bind that caller-local type — a block-local is
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// visible only within its OWN source. `lib.sx` defines
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// `Bad :: struct($T) { x: T; y: LocalOnly; }`; `main` declares `LocalOnly` only
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// inside its own body before instantiating `Bad(s32)`. The imported template's
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// module cannot see a caller block-local, so `y: LocalOnly` is undeclared in the
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// lib file.
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//
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// Before the fix the global `local_type_names` set was source-insensitive: the
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// template's field resolution (run in the template's source context, E3
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// attempt-4) consulted it, found the caller's `LocalOnly`, and silently compiled
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// (printed a value, exit 0). `local_type_names` is now keyed by declaring source,
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// so a cross-source block-local no longer leaks into another source's resolution.
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//
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// Expected: `error: unknown type 'LocalOnly'` pointing into lib.sx; exit 1.
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// Regression (stdlib E3 attempt-5).
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#import "modules/std.sx";
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#import "0762-modules-imported-generic-caller-local-field-leak/lib.sx";
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main :: () -> s32 {
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LocalOnly :: struct { v: s32; }
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b : Bad(s32) = .{ x = 1, y = .{ v = 9 } };
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print("{} {}\n", b.x, b.y.v);
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return 0;
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}
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