prisma format panics when you use a colon to declare field type (field: Type syntax)

[mikeyhew]

This is my schema. There is a syntax error because of the colon after name and htmlTitle. However I would expect to get a syntax error message instead of a panic about unreachable code.

Here is the offending schema file:

// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

generator client {
  provider = "prisma-client-js"
}

model Site {
  name: String
  htmlTitle: String
}

here is the panic message:

thread 'main' panicked at 'internal error: entered unreachable code: Encountered impossible declaration during formatting: [Start { rule: LEGACY_COLON, pos: Position { pos: 256 } }, End { rule: LEGACY_COLON, pos: Position { pos: 257 } }]', libs/datamodel/core/src/ast/reformat/reformatter.rs:899:18
stack backtrace:
   0: _rust_begin_unwind
   1: core::panicking::panic_fmt
   2: datamodel::ast::reformat::reformatter::Reformatter::reformat_generic_token
   3: datamodel::ast::reformat::reformatter::Reformatter::reformat_model::{{closure}}
   4: datamodel::ast::reformat::reformatter::Reformatter::reformat_block_element_internal
   5: datamodel::ast::reformat::reformatter::Reformatter::reformat_internal
   6: datamodel::ast::reformat::reformatter::Reformatter::reformat_to
   7: prisma_fmt::format::run
   8: prisma_fmt::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[janpio]

I can confirm this:

C:\Users\Jan\Documents\throwaway\next-prisma-3>npx prisma format
Environment variables loaded from .env
Prisma schema loaded from prisma\schema.prisma
Error: Command failed with exit code 101: C:\Users\Jan\Documents\throwaway\next-prisma-3\node_modules\@prisma\engines\prisma-fmt-windows.exe format -i C:\Users\Jan\Documents\throwaway\next-prisma-3\prisma\schema.prisma
thread 'main' panicked at 'internal error: entered unreachable code: Encountered impossible declaration during formatting: [Start { rule: LEGACY_COLON, pos: Position { pos: 161 } }, End { rule: LEGACY_COLON, pos: Position { pos: 162 } }]', libs\datamodel\core\src\ast\reformat\reformatter.rs:899:18
stack backtrace:
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[janpio]

Btw, the Prisma VSCode extension uses the : (or the overall GraphQL-ness of the definition) as an indicator to show this nice error message:

Not super correct, but I see why it thinks this might be GraphQL.