test(ir): lock error-set convergence before A5.1 extraction (A5.1 scaffolding step 1)

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Test-first scaffolding ahead of extracting src/ir/error_analysis.zig — no code
change to the convergence targets (convergeInferredErrorSets /
convergeClosureShapeSets / collectErrorSites / collectClosureShapes).

Adds 2 unit tests via the already-pub convergence functions (no new exposure):
- convergeInferredErrorSets transitive/SCC: a `caller :: () -> ! { try raiser(); }`
  with no direct raise converges to raiser's {Foo} across the try edge — the
  whole-program fixpoint A5.1 must preserve. (Today's E1.4b test only covered a
  direct raiser + the empty-set warning.)
- convergeClosureShapeSets: a bare-`!` closure literal `() -> ! { raise error.Bar }`
  inside a host fn unions {Bar} into one shape_inferred_sets entry.

Adds 2 .ir snapshots (first .ir for these error forms), vetted clean
(idempotent, path-free, no #run): 1006-errors-inferred-error-sets (inferred-set
error-channel shapes) and 1009-errors-catch (catch lowering). 1004-errors-try
was already pinned.

PLAN-ERR is complete/idle, so the A5 overlap risk is low (the target functions
are stable, not in-flight). The sub-step-2 module will be named
src/ir/error_analysis.zig, NOT errors.zig (src/errors.zig is the DiagnosticList).

zig build, zig build test, tests/run_examples.sh (357/0) all green.

...

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agra

2026-06-02 22:57:39 +03:00

parent f3bda369f6

commit 9153f958ea

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