The compiler allows local variables with type names:

Str str := "j"  // compiles, valid
str := "j"      // compiles, valid
Str := "j"      // does not compile, valid
Str Str := "j"  // compiles, bug

When defined this way, the variable named Str cannot be used. eg this fails to compile:

echo(Str)

The same problem affects parameters.

Promoted to ticket #1297 and assigned to brian

Thanks for reporting

Renamed from Variable identifier bug to Report variable names which conflict with imported types

Ticket resolved in 1.0.56

This situation will now report a compiler error