Fix generics issue #1345

[sdghchj]

Describe the PR
fix generic bug: a struct field with complex generic type.

for example:

type MyFieldStruct[T1 any, T2 any] struct {
        Data1   T1
        Data2   T2
}

type Nested[T any] struct{
        Value T
}

type MyStruct[T any] struct{
        Field1 *T
        Field2 []T
        Field3 MyFieldStruct[T, string]
        field4  Nested[Nested[string]]
}

Relation issue
#1345

[codecov]

Codecov Report

Base: 95.65% // Head: 95.68% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (c264b4b) compared to base (04c699c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1349      +/-   ##
==========================================
+ Coverage   95.65%   95.68%   +0.02%     
==========================================
  Files          14       14              
  Lines        2875     2894      +19     
==========================================
+ Hits         2750     2769      +19     
  Misses         70       70              
  Partials       55       55              

Impacted Files	Coverage Δ
generics.go	100.00% <100.00%> (ø)
generics_other.go	100.00% <100.00%> (ø)
parser.go	93.88% <100.00%> (ø)

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[ubogdan]

LGTM