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sequenceDiagram
    participant Client as Client Code
    participant Tester as vera.tester
    participant SMT as vera.smt (SmtContext)
    participant Z3 as Z3 Solver

    Client->>Tester: run vera test (func with String/Float64 params)
    Tester->>SMT: declare_string(name) / declare_float64(name)
    SMT->>Z3: create z3.String / z3.Real symbols
    Z3-->>SMT: SeqRef / ArithRef
    Tester->>Z3: add constraints (length ≤ 50, boundary seeds)
    Z3-->>Tester: model
    Tester->>Tester: extract values (z3.String→str, z3.Real→float)
    Tester->>Tester: select calling convention
    alt String or Float64 present
        Tester->>Client: execute using raw_args (converted strings)
    else
        Tester->>Client: execute using standard args
    end
    Client-->>Tester: result

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

Codecov Report

❌ Patch coverage is 97.10145% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.32%. Comparing base (3939b9f) to head (1177385).
⚠️ Report is 3 commits behind head on main.

@@            Coverage Diff             @@
##             main     #441      +/-   ##
==========================================
+ Coverage   90.31%   90.32%   +0.01%     
==========================================
  Files          49       49              
  Lines       19278    19335      +57     
  Branches      220      220              
==========================================
+ Hits        17410    17464      +54     
- Misses       1864     1867       +3     
  Partials        4        4              

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VeraBench implications

This is significant for the benchmark in several ways:

1. String test_cases may become possible

Currently 26 of 50 problems have empty test_cases — most of these are Tier 2 (string/array) problems where vera run --fn couldn't handle string arguments (vera-bench#25 constraint comment, vera#403). If the raw_args calling convention now supports strings at runtime (not just in vera test), we could add string test_cases to Tier 2 problems and get run_correct metrics for them.

Question for the vera compiler team: Does this change also affect vera run --fn argument passing, or is it limited to vera test? Specifically, does vera run --fn greet -- "Alice" now work? If so, please comment on vera-bench#25 so we can plan adding string test_cases to Tier 2 problems.

2. vera test as additional validation

We could integrate vera test into the VeraBench validation pipeline for problems with String/Float64 parameters. Related: vera-bench#25 (expand to 75+ problems) — new problems could use vera test as an additional correctness check during development. Also relates to vera-bench#31 (automated scheduled runs) where vera test could be part of the CI validation step.

3. Future problem expansion

For vera-bench#25, String and Float64 input generation means new Tier 2 problems can be more thoroughly tested. Float64 problems would be a new problem category. The vera-bench#25 constraints about vera test limitations (previously noted via vera#169) are now partially lifted.

4. Still blocked for ADTs

Tier 3/4 ADT problems remain untestable via vera test (vera#440). The empty test_cases for List/Tree/Option problems will persist until ADT input generation lands.

Related vera-bench issues

• vera-bench#25 — Expand to 75+ problems (String/Float64 test generation unblocks new problem types)
• vera-bench#31 — Automated scheduled runs (vera test could be part of validation)
• vera-bench#5 — Test coverage (integrating vera test into the validation pipeline)

Thanks for the detailed analysis. Answering your question directly:

vera run --fn string argument support is NOT new to this PR. String argument passing (allocating strings into WASM linear memory for vera run --fn greet -- "Alice") was implemented in v0.0.102 as part of #263/#403 — the CompileResult.fn_param_types field and the raw_args path in execute() that handles i32_pair. That has been working since then.

What this PR adds is different: vera test can now generate String and Float64 values via Z3 and feed them to the contract testing engine. Previously, functions with those parameter types were skipped entirely by the Z3 input generation pipeline.

On String return values from vera run --fn: If a function returns a String, vera run --fn currently prints the WASM pointer integer (e.g. 8219), not the decoded string. This is a limitation of the CLI output layer — String return values are i32_pair in WASM and the result printer does not decode them back to text. For VeraBench test_cases that check String return values, you would need the function to use IO.print instead of returning a String directly.

Summary for vera-bench#25: String inputs to vera run --fn work (since v0.0.102). String return values from vera run --fn do not print as text (separate issue). vera test now validates String/Float64 contracts, which is useful for contract correctness checking in the benchmark pipeline but not for output comparison in test_cases.