Zig: Remove fields on `type` redundant with @typeInfo

[tadeokondrak]

I think these are already deprecated from scattered comments on issues, but it would be nice to have an accepted issue to point to.

• Int
  
  
  
  • bit_count
  
  
  • is_signed
  
  
• Float
  
  
  
  • bit_count
  
  
• Pointer
  
  
  
  • Child
  
  
  • alignment
  
  
• Array
  
  
  
  • Child
  
  
  • len
  
  
• ErrorUnion
  
  
  
  • Payload
  
  
  • ErrorSet
  
  
• Optional
  
  
  
  • Child
  
  
• Fn
  
  
  
  • ReturnType
  
  
  • is_var_args
  
  
  • arg_count
  
  

[daurnimator]

Notably, if we remove these (which I think we should), they should be removed from error messages too.
Infact, the change in error messages can occur first.

[tadeokondrak]

I think the only time it shows up in error messages is for the name of an inferred error set:

buf_appendf(&err_set_type->name, "@TypeOf(%s).ReturnType.ErrorSet", buf_ptr(&fn_entry->symbol_name));

Not sure what to replace it with.

[Vexu]

Duplicate of #2117 assuming it applies to all the other redundant fields.

[lithdew]

@Vexu would it be possible to have zig fmt replace usages of these deprecated fields with their standard library equivalents?

[Vexu]

No. zig fmt doesn't know anything about types and would just lead to more breakage. However I believe these are quite rare in anything made after the introduction of @typeInfo.