Tested off `ghc-8.6.1-alpha1`, running on macOS 10.13.5. 1. Compile a GHC that uses `integer-gmp`. 2. Compile a GHC that uses `integer-simple`. 3. Make `Main.hs`: > ```haskell > {-# LANGUAGE TemplateHaskell #-} > main = print $([e| 0 |]) > ``` 4. Try to compile the file with `integer-gmp` `ghc` and `integer-simple` `ghc-iserv`. * Expected behavior: (compiles fine and executable prints `0`) or (outputs to-the-point error message) * Actual: ```none [1 of 1] Compiling Main ( Main.hs, Main.o ) Main.hs:2:14: error: • Exception when trying to run compile-time code: ghc: ghc-iserv terminated (-11) Code: [| 0 |] • In the untyped splice: $([| 0 |]) | 2 | main = print $([e| 0 |]) | ^^^^^^^^^^^ ``` 4. Try to compile the file with `integer-simple` `ghc` and `integer-gmp` `ghc-iserv`. * Expected behavior: (compiles fine and executable prints `0`) or (outputs to-the-point error message) * Actual: ```none [1 of 1] Compiling Main ( Main.hs, Main.o ) Main.hs:2:14: error: • Exception when trying to run compile-time code: heap overflow Code: [| 0 |] • In the untyped splice: $([| 0 |]) | 2 | main = print $([e| 0 |]) | ^^^^^^^^^^^ ``` For more fun, replace the `0` with a `1`. `gmp` `ghc` + `simple` `iserv` continues to explode. This is better than `simple` `ghc` + `gmp` `iserv`: ```bash $ ./Main 283468057265 $ ./Main 283468057265 $ $simple_ghc -fexternal-interpreter -pgmi=$gmp_iserv Main.hs # again # ... $ ./Main 283468057105 ``` Absolutely delicious. There is a similar situation for fractional literals. It would be nice if there were at least a warning for situations like this.