2173e196fe
Mirrors the layout of octive-lean: lakefile, justfile, gitignored
upstream clone, a top-level library module, and a Main entry point
that switches between REPL and file execution.
Module skeleton in GolangLean/:
Token, AST — real ports of go/token and go/ast
Scanner, Parser — stubs throwing notImpl, point at upstream
Value, Env, Error — runtime data shapes
Eval, Builtins, REPL — stubs that compile and run as a placeholder
PureEval, BigStep,
ValueEquiv — formal-semantics layer (mirroring octive-lean)
where cross-language proof eventually lives.
The proof layer is shaped identically to octive-lean's so that
theorems about Go semantics will share their form with the Octave
ones — that shared shape is the candidate for the future
cross-language core.
Upstream reference go-upstream/ (shallow clone of golang/go) is
gitignored.
27 lines
1.2 KiB
Text
27 lines
1.2 KiB
Text
namespace GolangLean
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/-- Runtime / static errors produced anywhere in the Go toolchain. -/
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inductive GoError where
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| scan (msg : String) (line col : Nat) -- lexical
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| parse (msg : String) (line col : Nat) -- syntactic
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| typeErr (msg : String) -- static type-check
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| runtime (msg : String) -- panic / runtime
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| nilDeref -- nil-pointer dereference
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| indexOOB (i n : Int) -- index out of range
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| divByZero
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| notImpl (what : String) -- placeholder for stubs
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deriving Repr, Inhabited
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def GoError.toString : GoError → String
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| .scan m l c => s!"scan error: {m} ({l}:{c})"
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| .parse m l c => s!"parse error: {m} ({l}:{c})"
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| .typeErr m => s!"type error: {m}"
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| .runtime m => s!"runtime error: {m}"
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| .nilDeref => "runtime error: nil pointer dereference"
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| .indexOOB i n => s!"runtime error: index out of range [{i}] with length {n}"
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| .divByZero => "runtime error: integer divide by zero"
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| .notImpl what => s!"not implemented: {what}"
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instance : ToString GoError := ⟨GoError.toString⟩
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end GolangLean
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