Cubic/Exponential compilation time for very large anonymous record
Open
Area-Compiler-PatternMatching
Bug
Impact-Medium
- Dominant language
- F#
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Description
See current repro at end of issue
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**Repro steps**
1. Open Program.fs in [LargeArrayRepro.zip](https://github.com/dotnet/fsharp/files/6602731/LargeArrayRepro.zip).
It contains a large array of constants.
2. Try typing `let vector =` at the beginning and you will get a Stack Overflow in Rider and Visual Studio (16.10)
This is probably because the array is treated as a pattern before you write ``=``
Stacktrace demonstrates multiple recursive calls leading to an overflow.
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