Bug: Cannot construct a value of type: PlutusTx.Builtins.Internal.BuiltinUnit#7162
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Bug: Cannot construct a value of type: PlutusTx.Builtins.Internal.BuiltinUnit#7162
Cannot construct a value of type: PlutusTx.Builtins.Internal.BuiltinUnit#7162Conversation
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SeungheonOh
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Jul 25, 2025
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I prefer adding special handling for providing better error message instead of disabling simplpass entirely. It seems writing a new simplifier(or rather, unfolder) would require some changes to GHC itself which would be undesirable.
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zliu41
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Feb 5, 2026
Add detection of opaque builtin types (BuiltinUnit, BuiltinData, etc.) from PlutusTx.Builtins.Internal and provide actionable guidance when users hit "Cannot construct a value of type" errors. These errors typically occur when where-bindings inside compile quotations trigger stage violations. The improved messages explain the cause and suggest moving bindings to top-level.
Exercise the improved error messages for various opaque builtin types: BuiltinUnit, BuiltinData, BuiltinByteString, BuiltinString, BuiltinList. Includes positive test for BuiltinInteger (type alias, not opaque). Uses context-level=0 to avoid package hash mismatches between local and CI builds in golden file output.
Add troubleshooting section explaining why where-bindings inside compile quotations fail with 'Cannot construct a value of type' errors. Provides concrete before/after code examples showing how to move bindings to top-level.
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Closes https://github.com/IntersectMBO/plutus-private/issues/1626