See https://github.com/tbeu/matio/pull/64

matdump.log

      Name: inline_object
      Rank: 2
Class Type: Object
Class Name: inline
Fields[6] {
      Name: expr
      Rank: 2
Dimensions: 1 x 3
Class Type: Character Array
 Data Type: 8-bit, unsigned integer
{
t^2
}
      Name: inputExpr
      Rank: 2
Dimensions: 1 x 23
Class Type: Character Array
 Data Type: 8-bit, unsigned integer
{
 t = INLINE_INPUTS_{1};
}
      Name: args
      Rank: 2
Dimensions: 1 x 1
Class Type: Character Array
 Data Type: 8-bit, unsigned integer
{
t
}
0 
1 
1 
}
Empty
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