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Haskell backend prints a list [Char] containing characters as string #359

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andreasabel opened this issue Apr 24, 2021 · 2 comments
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Haskell backend prints a list [Char] containing characters as string #359

andreasabel opened this issue Apr 24, 2021 · 2 comments
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@andreasabel
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bug Haskell lists Concerning list categories and separator/terminator/delimiter pragmas printer Concerning the generated printer
Milestone
2.9.2

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@andreasabel
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Grammar

(:[]). [Char] ::= "*" Char ";";
(:).   [Char] ::= "*" Char ";" [Char];

and input

* 'A';
* 'B';
* 'C';

results in printed output

"ABC"

The other backends print this correctly.
@andreasabel andreasabel added bug Haskell lists Concerning list categories and separator/terminator/delimiter pragmas printer Concerning the generated printer labels Apr 24, 2021
@andreasabel andreasabel mentioned this issue May 2, 2021
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@andreasabel andreasabel added this to the 2.9.2 milestone May 2, 2021
@andreasabel
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The overloaded prt function can naturally not deal with both of [Char] and String, since these are the same type. Should not be a problem with Text tokens, though.

A way to fix this would be to have a non-overloaded printing function for String, so it does not clash with [Char].

@andreasabel andreasabel self-assigned this May 2, 2021
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  • If category [Char] is used, we now have printString instead of instance Print String.
  • Method prtList has been removed from class Print.

andreasabel added a commit that referenced this issue May 2, 2021
@andreasabel
[ #359 ] Haskell: fixed printing of String lists
8fc03a1 
Having Char lists and String will atm give a compilation error for the generated
Printer, because

    instance [Char]

clashes with

    instance String
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@andreasabel andreasabel

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bug Haskell lists Concerning list categories and separator/terminator/delimiter pragmas printer Concerning the generated printer
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2.9.2
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