fd3d42ae33
git-subtree-dir: golang-lean git-subtree-mainline:6487c7046fgit-subtree-split:f5f1701922
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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