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Merged
leonardoalt merged 14 commits into from
Aug 3, 2026
Merged

Compile immutables (loadimmutable / setimmutable) #154

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f712217
Take `loadimmutable` as a modeled built-in from pinned yul-semantics
leonardoalt Jul 30, 2026
7fce09e
Add the fixed-width `Asm.pushImmutable` placeholder, end to end
leonardoalt Jul 30, 2026
c17d0ad
Carry `Asm.pushImmutable` through the SSA-CFG backend and certificate…
leonardoalt Aug 3, 2026
048c0f8
Prove that no step ever rewrites the immutable map, and re-pin SPEC.md
leonardoalt Aug 3, 2026
a1a394b
Compile immutables: placeholder reads and constructor patching
leonardoalt Aug 3, 2026
8920039
Re-pin the spec and gas baselines for immutables support
leonardoalt Aug 3, 2026
d50b766
Repair doc comments mangled by the parameter-threading rewrite
leonardoalt Aug 3, 2026
d2c01ed
Make the immutable assignment a defaulted trailing argument, and name…
leonardoalt Aug 3, 2026
4c409a8
Address review: SSA/classic offset mismatch, and state the desugaring…
leonardoalt Aug 3, 2026
72e3a57
Prove the immutable placeholder offsets
leonardoalt Aug 3, 2026
fde8cf2
Re-pin the one gas row the SSA offset fix corrects
leonardoalt Aug 3, 2026
0e068a2
Reject the two immutable shapes that could silently miscompile
leonardoalt Aug 3, 2026
3d4e4c4
Require an immutable's setter to sit in the reader's parent
leonardoalt Aug 3, 2026
c65c6b2
Reject unpatchable root reads; decode setimmutable's value args
leonardoalt Aug 3, 2026
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6 changes: 4 additions & 2 deletions DESIGN.md
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Expand Up @@ -705,8 +705,10 @@ CI), which must stay in sync as coverage grows.
the verified smart layout fallback described above, then the guarded memory
spilling fallback when a safe scratch reservation is available. Irreducible
frames without that contract still need EIP-8024 activation upstream.
Independent unsupported operations such as `gas`, immutables, and live
linker-symbol values are not accepted merely because spilling succeeds.
Independent unsupported operations such as `gas` are not accepted merely
because spilling succeeds. Immutables and supplied linker-symbol values are
now handled (see the immutables and library-linking entries), but neither is
a consequence of spilling.
* **Optimizer.** A verified multi-stage pipeline, iterated six times, runs in
front of the backend for block-rooted `compileSource` inputs (see
`Optimizer/Implementation/Pipeline.lean` for the current stage list, and
Expand Down
17 changes: 15 additions & 2 deletions README.md
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Expand Up @@ -325,8 +325,21 @@ to fall back to doing nothing.
and call-path footprint, not the total number of selected bindings. Existing
successful candidates still win before this fallback, so their bytecode and
gas are unchanged. Programs without a safe guard contract remain rejected.
This fallback addresses stack reach only; `gas` and immutables remain
separate unsupported features.
This fallback addresses stack reach only; `gas` remains a separate
unsupported feature.
- **Immutables.** `loadimmutable(name)` compiles to a fixed-width `PUSH32`
placeholder (`Asm.pushImmutable`) whose 32 immediate bytes therefore sit at a
value-independent offset, and `setimmutable(base, name, value)` is **desugared
in the front end** to one `mstore` per recorded placeholder offset before the
object layer runs. Those offsets are a theorem, not a trusted computation:
`immutableOffsets_correct` shows each one really does locate that immutable's
32-byte immediate in the emitted code, so a wrong offset cannot silently
miscompile. The emitted constants must also match the layout the code runs
under — that is `ConfMatch.imms`, the counterpart of `Layout.Consistent` for
data segments, discharged because no step ever rewrites `env.immutable`.
What is *not* proved is `setimmutable`'s meaning: it has no source semantics,
so the correctness theorem covers the desugared program, in the same family as
`memoryguard` desugaring rather than a proved source-to-source pass.
- **Library linking.** `compileSource` takes an optional `LinkEnv` — the same
`file.sol:Lib = 0xADDR` information as solc's `--libraries`, exposed on the
CLI as `yulc --libraries=NAME=0xADDR[,…]`. A live `linkersymbol("file:Lib")`
Expand Down
43 changes: 22 additions & 21 deletions SPEC.md
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Expand Up @@ -9,8 +9,8 @@ computed by walking each headline theorem's **statement** (never its proof),
so the hundreds of preservation lemmas are excluded automatically — what
remains is exactly the specification vocabulary.

**Audited surface: 89 declarations** \
relations: 12 · structures: 12 · data defs: 51 · statements: 9 · artifact signatures: 4 \
**Audited surface: 90 declarations** \
relations: 12 · structures: 12 · data defs: 52 · statements: 9 · artifact signatures: 4 \
**External boundary: 155 declarations** across the two pinned semantics.

Axioms are pinned separately in `Checks.lean` (only `propext`,
Expand All @@ -26,7 +26,7 @@ flowchart TD
S["Headline theorem statements (9)"]
R["Match relations & predicates (12)"]
T["Structures & data types (12)"]
D["Data definitions (51)"]
D["Data definitions (52)"]
A["Artifact signatures (4) — type only, bodies free"]
end
subgraph external ["trusted ground truth — pinned dependency semantics"]
Expand All @@ -49,13 +49,13 @@ The shape of each guarantee. Read these first: the honest scoping lives here.

| declaration | source | hash |
|---|---|---|
| `YulEvmCompiler.Optimizer.LocalPass.optimize_then_compile_correct` | [YulEvmCompiler/Optimizer/Spec/Backend.lean#L30](YulEvmCompiler/Optimizer/Spec/Backend.lean#L30) | `b97af54bdbe04c9f` |
| `YulEvmCompiler.compileObject_consistent` | [YulEvmCompiler/ObjectCompile.lean#L945](YulEvmCompiler/ObjectCompile.lean#L945) | `6772c506631c72d` |
| `YulEvmCompiler.compileObject_correct` | [YulEvmCompiler/ObjectCompile.lean#L968](YulEvmCompiler/ObjectCompile.lean#L968) | `6c28d636cabfed71` |
| `YulEvmCompiler.compile_correct` | [YulEvmCompiler/Correctness.lean#L71](YulEvmCompiler/Correctness.lean#L71) | `ec51f1c553a52f8a` |
| `YulEvmCompiler.compile_correct_eval` | [YulEvmCompiler/Correctness.lean#L265](YulEvmCompiler/Correctness.lean#L265) | `999e96fc09d553b6` |
| `YulEvmCompiler.compile_correct_withPayload` | [YulEvmCompiler/Correctness.lean#L178](YulEvmCompiler/Correctness.lean#L178) | `50e2c3107c79f9ea` |
| `YulEvmCompiler.compiled_constructor_returns` | [YulEvmCompiler/ObjectCompile.lean#L1000](YulEvmCompiler/ObjectCompile.lean#L1000) | `9a99d76f5d037853` |
| `YulEvmCompiler.Optimizer.LocalPass.optimize_then_compile_correct` | [YulEvmCompiler/Optimizer/Spec/Backend.lean#L30](YulEvmCompiler/Optimizer/Spec/Backend.lean#L30) | `d0b206bd07992491` |
| `YulEvmCompiler.compileObject_consistent` | [YulEvmCompiler/ObjectCompile.lean#L1030](YulEvmCompiler/ObjectCompile.lean#L1030) | `6772c506631c72d` |
| `YulEvmCompiler.compileObject_correct` | [YulEvmCompiler/ObjectCompile.lean#L1053](YulEvmCompiler/ObjectCompile.lean#L1053) | `6c28d636cabfed71` |
| `YulEvmCompiler.compile_correct` | [YulEvmCompiler/Correctness.lean#L71](YulEvmCompiler/Correctness.lean#L71) | `5da903b63e70655d` |
| `YulEvmCompiler.compile_correct_eval` | [YulEvmCompiler/Correctness.lean#L267](YulEvmCompiler/Correctness.lean#L267) | `44f9f79182ec7eda` |
| `YulEvmCompiler.compile_correct_withPayload` | [YulEvmCompiler/Correctness.lean#L179](YulEvmCompiler/Correctness.lean#L179) | `7fe10d0f9ce8438a` |
| `YulEvmCompiler.compiled_constructor_returns` | [YulEvmCompiler/ObjectCompile.lean#L1091](YulEvmCompiler/ObjectCompile.lean#L1091) | `9a99d76f5d037853` |
| `YulParser.parse_canon_block` | [YulParser/Stmt.lean#L313](YulParser/Stmt.lean#L313) | `565944a3acfe55d3` |
| `YulParser.parse_canon_obj` | [YulParser/Obj.lean#L139](YulParser/Obj.lean#L139) | `f40759b3ea852432` |

Expand All @@ -67,13 +67,13 @@ How a source state/outcome corresponds to a target state/outcome. The heart of t
|---|---|---|
| `YulEvmCompiler.HaltMatch` | [YulEvmCompiler/StateRel.lean#L1252](YulEvmCompiler/StateRel.lean#L1252) | `6557b5faae906a61` |
| `YulEvmCompiler.HaltedMatch` | [YulEvmCompiler/OpStep.lean#L50](YulEvmCompiler/OpStep.lean#L50) | `bd6cde934ed46ce6` |
| `YulEvmCompiler.IsCallOp` | [YulEvmCompiler/OpTable.lean#L90](YulEvmCompiler/OpTable.lean#L90) | `93349e44f6cba900` |
| `YulEvmCompiler.IsCreateOp` | [YulEvmCompiler/OpTable.lean#L98](YulEvmCompiler/OpTable.lean#L98) | `188d5668d6c00b2b` |
| `YulEvmCompiler.IsCallOp` | [YulEvmCompiler/OpTable.lean#L90](YulEvmCompiler/OpTable.lean#L90) | `4068ec650592c03e` |
| `YulEvmCompiler.IsCreateOp` | [YulEvmCompiler/OpTable.lean#L98](YulEvmCompiler/OpTable.lean#L98) | `b78befe1df320f16` |
| `YulEvmCompiler.LogEntryMatch` | [YulEvmCompiler/StateRel.lean#L934](YulEvmCompiler/StateRel.lean#L934) | `44220474a51dc6b6` |
| `YulEvmCompiler.LogsMatch` | [YulEvmCompiler/StateRel.lean#L942](YulEvmCompiler/StateRel.lean#L942) | `6d1d2dd35bc25e39` |
| `YulEvmCompiler.MemMatch` | [YulEvmCompiler/StateRel.lean#L32](YulEvmCompiler/StateRel.lean#L32) | `e48211ef54b0d862` |
| `YulEvmCompiler.Optimizer.Sound` | [YulEvmCompiler/Optimizer/Spec/LocalPass.lean#L64](YulEvmCompiler/Optimizer/Spec/LocalPass.lean#L64) | `d9d7947b1bb2287` |
| `YulEvmCompiler.RunResolvedObject` | [YulEvmCompiler/ObjectCompile.lean#L962](YulEvmCompiler/ObjectCompile.lean#L962) | `22471129a83f65e3` |
| `YulEvmCompiler.RunResolvedObject` | [YulEvmCompiler/ObjectCompile.lean#L1047](YulEvmCompiler/ObjectCompile.lean#L1047) | `22471129a83f65e3` |
| `YulEvmCompiler.SelfdestructEntryMatch` | [YulEvmCompiler/StateRel.lean#L956](YulEvmCompiler/StateRel.lean#L956) | `3b1f6c17c9cc3b3f` |
| `YulEvmCompiler.SelfdestructsMatch` | [YulEvmCompiler/StateRel.lean#L963](YulEvmCompiler/StateRel.lean#L963) | `8fb6a9b19498848` |
| `YulParser.Parser` | [YulParser/Core.lean#L13](YulParser/Core.lean#L13) | `c3c38aa9630539e` |
Expand All @@ -84,12 +84,12 @@ The vocabulary the guarantee is phrased in.

| declaration | source | hash |
|---|---|---|
| `YulEvmCompiler.CallsRealized` | [YulEvmCompiler/LowerDefs.lean#L308](YulEvmCompiler/LowerDefs.lean#L308) | `60cec34bf4c3cac9` |
| `YulEvmCompiler.CreatesRealized` | [YulEvmCompiler/LowerDefs.lean#L355](YulEvmCompiler/LowerDefs.lean#L355) | `d608d1effb3509d1` |
| `YulEvmCompiler.CallsRealized` | [YulEvmCompiler/LowerDefs.lean#L329](YulEvmCompiler/LowerDefs.lean#L329) | `60cec34bf4c3cac9` |
| `YulEvmCompiler.CreatesRealized` | [YulEvmCompiler/LowerDefs.lean#L376](YulEvmCompiler/LowerDefs.lean#L376) | `d608d1effb3509d1` |
| `YulEvmCompiler.EnvMatch` | [YulEvmCompiler/StateRel.lean#L429](YulEvmCompiler/StateRel.lean#L429) | `9cea97fa8ae94f99` |
| `YulEvmCompiler.ExternalCodeMatch` | [YulEvmCompiler/StateRel.lean#L494](YulEvmCompiler/StateRel.lean#L494) | `2d46717e52ff1871` |
| `YulEvmCompiler.ExternalModel` | [YulEvmCompiler/AsmSem.lean#L34](YulEvmCompiler/AsmSem.lean#L34) | `75bd1eadd7f209e2` |
| `YulEvmCompiler.ExternalsRealized` | [YulEvmCompiler/LowerDefs.lean#L403](YulEvmCompiler/LowerDefs.lean#L403) | `7fd85ee803561fa8` |
| `YulEvmCompiler.ExternalsRealized` | [YulEvmCompiler/LowerDefs.lean#L424](YulEvmCompiler/LowerDefs.lean#L424) | `7fd85ee803561fa8` |
| `YulEvmCompiler.FrameOK` | [YulEvmCompiler/StateRel.lean#L1240](YulEvmCompiler/StateRel.lean#L1240) | `97dc148ae9bebed5` |
| `YulEvmCompiler.Instr` | [YulEvmCompiler/Instr.lean#L38](YulEvmCompiler/Instr.lean#L38) | `6d2465d1d211750b` |
| `YulEvmCompiler.Optimizer.LocalPass` | [YulEvmCompiler/Optimizer/Spec/LocalPass.lean#L72](YulEvmCompiler/Optimizer/Spec/LocalPass.lean#L72) | `6b8887154f59257c` |
Expand All @@ -107,17 +107,18 @@ Concrete spec-level functions (outcome maps, canonicalisation, byte assembly).
| `YulEvmCompiler.Instr.opByte` | [YulEvmCompiler/Instr.lean#L52](YulEvmCompiler/Instr.lean#L52) | `1063189e226fb3ef` |
| `YulEvmCompiler.assemble` | [YulEvmCompiler/Instr.lean#L188](YulEvmCompiler/Instr.lean#L188) | `c1c9c0c9a1ad80c8` |
| `YulEvmCompiler.assembleBytes` | [YulEvmCompiler/Instr.lean#L176](YulEvmCompiler/Instr.lean#L176) | `29d8e692638cce98` |
| `YulEvmCompiler.assembleWithPayload` | [YulEvmCompiler/LowerDefs.lean#L143](YulEvmCompiler/LowerDefs.lean#L143) | `55ba5256c2c91c08` |
| `YulEvmCompiler.assembleWithPayload` | [YulEvmCompiler/LowerDefs.lean#L144](YulEvmCompiler/LowerDefs.lean#L144) | `55ba5256c2c91c08` |
| `YulEvmCompiler.conv` | [YulEvmCompiler/Value.lean#L29](YulEvmCompiler/Value.lean#L29) | `25e701af8a9ce7bb` |
| `YulEvmCompiler.mkCode` | [YulEvmCompiler/Decode.lean#L23](YulEvmCompiler/Decode.lean#L23) | `edacb826e56f9571` |
| `YulEvmCompiler.natToBE` | [YulEvmCompiler/Instr.lean#L26](YulEvmCompiler/Instr.lean#L26) | `d47a19daef761803` |
| `YulEvmCompiler.opTable` | [YulEvmCompiler/OpTable.lean#L19](YulEvmCompiler/OpTable.lean#L19) | `58d5b129f84835ed` |
| `YulEvmCompiler.opTable` | [YulEvmCompiler/OpTable.lean#L19](YulEvmCompiler/OpTable.lean#L19) | `d48771ade3ef37b6` |
| `YulEvmCompiler.resolveForLayoutCases` | [YulEvmCompiler/ObjectResolve.lean#L77](YulEvmCompiler/ObjectResolve.lean#L77) | `a635c809600d2d8a` |
| `YulEvmCompiler.resolveForLayoutExpr` | [YulEvmCompiler/ObjectResolve.lean#L25](YulEvmCompiler/ObjectResolve.lean#L25) | `15bc9ca915a17f5a` |
| `YulEvmCompiler.resolveForLayoutExpr` | [YulEvmCompiler/ObjectResolve.lean#L25](YulEvmCompiler/ObjectResolve.lean#L25) | `6e8a6c9691954597` |
| `YulEvmCompiler.resolveForLayoutExprs` | [YulEvmCompiler/ObjectResolve.lean#L38](YulEvmCompiler/ObjectResolve.lean#L38) | `deee862dd8d61de4` |
| `YulEvmCompiler.resolveForLayoutStmt` | [YulEvmCompiler/ObjectResolve.lean#L45](YulEvmCompiler/ObjectResolve.lean#L45) | `ef48ed8902b73d01` |
| `YulEvmCompiler.resolveForLayoutStmts` | [YulEvmCompiler/ObjectResolve.lean#L71](YulEvmCompiler/ObjectResolve.lean#L71) | `e61eedc003fbb530` |
| `YulEvmCompiler.resultOf` | [YulEvmCompiler/StateRel.lean#L1264](YulEvmCompiler/StateRel.lean#L1264) | `9a4fae748007bd7b` |
| `YulEvmCompiler.unpatchedImmutables` | [YulEvmCompiler/Compile.lean#L342](YulEvmCompiler/Compile.lean#L342) | `4350bdab12d0a1ca` |
| `YulParser.afterBlockComment` | [YulParser/Tokens.lean#L30](YulParser/Tokens.lean#L30) | `5deac78dd9073c67` |
| `YulParser.canon` | [YulParser/Canon.lean#L82](YulParser/Canon.lean#L82) | `b2d8eb356dc83a9c` |
| `YulParser.decDigitVal` | [YulParser/Canon.lean#L52](YulParser/Canon.lean#L52) | `aa9b35f8e24246bf` |
Expand Down Expand Up @@ -161,8 +162,8 @@ The code being verified. Only the signatures are frozen; implementations are fre

| declaration | source | hash |
|---|---|---|
| `YulEvmCompiler.compile` | [YulEvmCompiler/Compile.lean#L335](YulEvmCompiler/Compile.lean#L335) | `49a8d9e93773bc82` |
| `YulEvmCompiler.compileObject` | [YulEvmCompiler/ObjectCompile.lean#L858](YulEvmCompiler/ObjectCompile.lean#L858) | `45cacb379f48e375` |
| `YulEvmCompiler.compile` | [YulEvmCompiler/Compile.lean#L352](YulEvmCompiler/Compile.lean#L352) | `8db82c40ac47d5a6` |
| `YulEvmCompiler.compileObject` | [YulEvmCompiler/ObjectCompile.lean#L927](YulEvmCompiler/ObjectCompile.lean#L927) | `45cacb379f48e375` |
| `YulParser.parseBlock` | [YulParser/Stmt.lean#L305](YulParser/Stmt.lean#L305) | `548f44114c0c0376` |
| `YulParser.parseObject` | [YulParser/Obj.lean#L131](YulParser/Obj.lean#L131) | `7de98252fdadddab` |

Expand Down
21 changes: 11 additions & 10 deletions SpecClosure.lean
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Expand Up @@ -511,7 +511,7 @@ toolchain. -/

-- BEGIN SPEC CLOSURE PIN (generated by scripts/update-spec.sh — do not edit by hand)
/-- info:
SPEC CLOSURE — audited this-repo surface (89 decls)
SPEC CLOSURE — audited this-repo surface (90 decls)
struct YulEvmCompiler.CallsRealized 60cec34bf4c3cac9
struct YulEvmCompiler.CreatesRealized d608d1effb3509d1
struct YulEvmCompiler.EnvMatch 9cea97fa8ae94f99
Expand All @@ -524,13 +524,13 @@ SPEC CLOSURE — audited this-repo surface (89 decls)
struct YulEvmCompiler.Instr 6d2465d1d211750b
datadef YulEvmCompiler.Instr.bytes 6cb9a3bc72e0ae11
datadef YulEvmCompiler.Instr.opByte 1063189e226fb3ef
relation YulEvmCompiler.IsCallOp 93349e44f6cba900
relation YulEvmCompiler.IsCreateOp 188d5668d6c00b2b
relation YulEvmCompiler.IsCallOp 4068ec650592c03e
relation YulEvmCompiler.IsCreateOp b78befe1df320f16
relation YulEvmCompiler.LogEntryMatch 44220474a51dc6b6
relation YulEvmCompiler.LogsMatch 6d1d2dd35bc25e39
relation YulEvmCompiler.MemMatch e48211ef54b0d862
struct YulEvmCompiler.Optimizer.LocalPass 6b8887154f59257c
statement YulEvmCompiler.Optimizer.LocalPass.optimize_then_compile_correct b97af54bdbe04c9f
statement YulEvmCompiler.Optimizer.LocalPass.optimize_then_compile_correct d0b206bd07992491
relation YulEvmCompiler.Optimizer.Sound d9d7947b1bb2287
relation YulEvmCompiler.RunResolvedObject 22471129a83f65e3
relation YulEvmCompiler.SelfdestructEntryMatch 3b1f6c17c9cc3b3f
Expand All @@ -539,24 +539,25 @@ SPEC CLOSURE — audited this-repo surface (89 decls)
datadef YulEvmCompiler.assemble c1c9c0c9a1ad80c8
datadef YulEvmCompiler.assembleBytes 29d8e692638cce98
datadef YulEvmCompiler.assembleWithPayload 55ba5256c2c91c08
artifact YulEvmCompiler.compile 49a8d9e93773bc82
artifact YulEvmCompiler.compile 8db82c40ac47d5a6
artifact YulEvmCompiler.compileObject 45cacb379f48e375
statement YulEvmCompiler.compileObject_consistent 6772c506631c72d
statement YulEvmCompiler.compileObject_correct 6c28d636cabfed71
statement YulEvmCompiler.compile_correct ec51f1c553a52f8a
statement YulEvmCompiler.compile_correct_eval 999e96fc09d553b6
statement YulEvmCompiler.compile_correct_withPayload 50e2c3107c79f9ea
statement YulEvmCompiler.compile_correct 5da903b63e70655d
statement YulEvmCompiler.compile_correct_eval 44f9f79182ec7eda
statement YulEvmCompiler.compile_correct_withPayload 7fe10d0f9ce8438a
statement YulEvmCompiler.compiled_constructor_returns 9a99d76f5d037853
datadef YulEvmCompiler.conv 25e701af8a9ce7bb
datadef YulEvmCompiler.mkCode edacb826e56f9571
datadef YulEvmCompiler.natToBE d47a19daef761803
datadef YulEvmCompiler.opTable 58d5b129f84835ed
datadef YulEvmCompiler.opTable d48771ade3ef37b6
datadef YulEvmCompiler.resolveForLayoutCases a635c809600d2d8a
datadef YulEvmCompiler.resolveForLayoutExpr 15bc9ca915a17f5a
datadef YulEvmCompiler.resolveForLayoutExpr 6e8a6c9691954597
datadef YulEvmCompiler.resolveForLayoutExprs deee862dd8d61de4
datadef YulEvmCompiler.resolveForLayoutStmt ef48ed8902b73d01
datadef YulEvmCompiler.resolveForLayoutStmts e61eedc003fbb530
datadef YulEvmCompiler.resultOf 9a4fae748007bd7b
datadef YulEvmCompiler.unpatchedImmutables 4350bdab12d0a1ca
struct YulParser.CTok f0018424d20ab2ce
relation YulParser.Parser c3c38aa9630539e
struct YulParser.QuotedScan fda150592f3cfc21
Expand Down
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