Variable name with special characters

Declaring a variable in GHCi with $ . is allowed, but they are not referable. I suppose that the parser should impose more restrictions at this.

*Main> let a$1 = 10
*Main> a$1
<interactive>:20:1: Not in scope: ‘a’

Prelude> let a.1 = 10
Prelude> a.1

<interactive>:9:1: Not in scope: ‘a’

Prelude> let a%1 = 1
Prelude> a%1
1
Prelude> let a^1 = 1
Prelude> a^1
1
Prelude> a^1 + 1
2

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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Variable name with special characters