🔥 remove: Drop an unused parser helper and two needless Sprintf calls

[135yshr]

Overview

Removes the code nothing can reach, and two fmt.Sprintf calls with nothing to format. Nothing a program does changes.

Removed	Why
Parser.prefixPrec (unexported)	Unary operators call parseExpr(precUnary) directly, so nothing calls it (staticcheck U1000)
fmt.Sprintf("%s", x) in codegen's genPartialCall	x is already a string (S1025)
fmt.Sprintf("Hiss! pipe target is not callable, nya~") in the interpreter	No verbs to format (S1039)

Kept on purpose

• Exported functions with no caller in this repository: meowrt.AsList, Parser.Errors and Environment.Set. The first push removed them. Their packages are importable by other modules, though, so removing them would stop a dependent module compiling on upgrade; Codex review pointed this out. They are restored unchanged. Dropping them belongs in a documented breaking release, if at all.
• Runtime functions that deadcode reports as unreachable (TryAsByte, AsByte, Nya, And, Or, BuiltinFunc, RunMain, ExitOnFurball): generated programs call them, directly or through RunMain/AsByte. deadcode can't see calls that exist only in Go the compiler generates.
• TrickType.String/Equals: they are what make TrickType a types.Type.
• Remaining staticcheck findings: they are style (ST1000 package comments, ST1003 names), not unused code.

The candidates came from staticcheck (the repo's all,-ST1005) and from deadcode -test run for both the native and the WASM (GOOS=js) build.

Found while checking this, not changed here

The spec has a Reassignment section (AssignStmt = identifier "=" Expr, "Rebinds an existing variable to a new value"). No AssignStmt exists, though: nyan x = 1 followed by x = 5 is refused with Variable x already declared in this scope. Whether to implement reassignment or remove that spec section is a language decision, so it is not part of this PR.

Verification

• go test ./... passes. Every golden prints exactly what it did before, so the codegen change emits the same Go.
• go vet ./... passes
• Golden files updated if needed: none moved
• go build ./... and the WASM playground build
• staticcheck no longer reports U1000, S1025 or S1039
• The examples the e2e job runs (hello, fibonacci, fizzbuzz, list_ops) run

Impact

• Compiler (lexer / parser / checker / codegen): parser, codegen
• Runtime (meowrt / file / http)
• CLI
• Documentation
• Playground: one Sprintf in the interpreter

AI Session

• Session URL: https://claude.ai/code/session_01Scc7p1RecmFoikhcXwnTMu

Checklist

• I have read the CONTRIBUTING guide
• My changes follow the project's coding style
• I have added/updated tests for my changes. No behaviour changes, so the existing suite is the check.
• Commit messages use gitmoji prefix

🤖 Generated with Claude Code

https://claude.ai/code/session_01Scc7p1RecmFoikhcXwnTMu

Summary by CodeRabbit

• Refactor
  • Simplified internal handling of typed partial applications and pipe expressions. The behavior and resulting error message remain unchanged.
  • Removed an unused internal parser helper. No public interfaces or end-user behavior changed.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-27T14:03:01.806024Z	94a2778	PR opened

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: fbc23870-14c4-4ed5-8959-58100f06fca3

📥 Commits

Reviewing files that changed from the base of the PR and between 6143dfe and 7321202.

📒 Files selected for processing (3)

• pkg/codegen/codegen.go
• pkg/interpreter/interpreter.go
• pkg/parser/parser.go

💤 Files with no reviewable changes (1)

• pkg/parser/parser.go

Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The code generator and interpreter simplify expressions without changing their described behavior. The parser removes the unexported prefixPrec helper.

Changes

Code cleanup

Layer / File(s)	Summary
Expression and helper cleanup pkg/codegen/codegen.go, pkg/interpreter/interpreter.go, pkg/parser/parser.go	The code generator simplifies the typed partial-application argument expression. The interpreter uses a string literal for the unchanged panic message. The parser removes prefixPrec.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Refactor

Merge Risk: ⚪ Minimal · up to 73212

This cleanup preserves the described behavior and presents no identified merge-blocking risk.

Architecture Summary

Architecture risk: 🔵 Low · up to 73212

The change affects 1 system.

Changed systems: pkg

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — pkg (service) was modified; 3 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in pkg/codegen/codegen.go: Simplifies formatting of the typed partial-application argument expression without changing the generated unboxing call.
• observed — Modified behavior in pkg/interpreter/interpreter.go: The non-callable pipe-target panic now uses a string literal rather than formatting an unchanged message.
• observed — Modified behavior in pkg/parser/parser.go: Removed prefixPrec, which mapped MINUS and NOT to precUnary and all other token types to precNone.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes all three cleanup changes: removing the unused parser helper and two unnecessary Sprintf calls.
Description check	✅ Passed	The description covers the required overview, verification, impact, AI session, and checklist sections. It provides detailed rationale and verification results. The Entire-Checkpoint field is not fill…

✨ Finishing Touches

📝 Generate docstrings

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• Create a new PR

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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_{A rabbit hops past lines of code,
Two simpler paths now share the road.
One parser helper takes its leave,
The syntax stays as you perceive.
Soft paws tap, and changes close.}

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 94a2778567

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