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Add variable name to error message #1195

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Add variable name to error message #1195

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4 changes: 3 additions & 1 deletion Strata/DL/Imperative/CmdType.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,9 @@ def Cmd.typeCheck {P C T} [ToFormat P.Ident] [ToFormat P.Ty] [ToFormat (Cmd P)]
else
let (xty, τ) ← TC.preprocess ctx τ xty
let (expr, ety, τ) ← TC.inferType ctx τ c expr
let τ ← TC.unifyTypes τ [(xty, ety)]
let τ ← (TC.unifyTypes τ [(xty, ety)]).mapError fun _ =>
md.toDiagnosticF f!"Variable '{x}' expected type {xty} but \
initialization expression has inferred type {ety}."
let (xty, τ) ← TC.postprocess ctx τ xty
let τ := TC.update τ x xty
let c := Cmd.init x xty (.det expr) md
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