Types like output(T), promise(T), and union(T_0, ..., T_N) should be
assignable from dynamic if they contain an element type that is
assignable from dynamic.
This allows consumers to use the following code to check if some type
behaves like the dynamic type w.r.t. conversions:
```
if t.AssignableFrom(model.DynamicType) {
}
```
Fixes#4703.
Add a rewriter that reifies implicit conversions into a call to the
`__convert` intrinsic. Code generators can recognize this intrinsic and
use it to generate appropriate conversion code.
Part of this work involves redesigning the type annotations system.
Annotations are now only applicable to opaque and object types. Instead
of inspecting annotations directly, code generators should use
`hcl2.GetSchemaForType` to extract the `schema.Type` for a `model.Type`.
Some property names are mapped from their `camelCase` Pulumi name to a
`snake_case` Python name. This mapping is irregular, and only occurs for
resources properties and function calls.
Note that there's still more work to do here: this only fixes names on
the output side; the input side is still broken for nested resource
proprerties and function calls.
The underlying design--annotated types in `hcl2/model`--may need some
additional work in the future, but I _believe_ it's good enough for now.
* Make `async:true` the default for `invoke` calls (#3750)
* Switch away from native grpc impl. (#3728)
* Remove usage of the 'deasync' library from @pulumi/pulumi. (#3752)
* Only retry as long as we get unavailable back. Anything else continues. (#3769)
* Handle all errors for now. (#3781)
* Do not assume --yes was present when using pulumi in non-interactive mode (#3793)
* Upgrade all paths for sdk and pkg to v2
* Backport C# invoke classes and other recent gen changes (#4288)
Adjust C# generation
* Replace IDeployment with a sealed class (#4318)
Replace IDeployment with a sealed class
* .NET: default to args subtype rather than Args.Empty (#4320)
* Adding system namespace for Dotnet code gen
This is required for using Obsolute attributes for deprecations
```
Iam/InstanceProfile.cs(142,10): error CS0246: The type or namespace name 'ObsoleteAttribute' could not be found (are you missing a using directive or an assembly reference?) [/Users/stack72/code/go/src/github.com/pulumi/pulumi-aws/sdk/dotnet/Pulumi.Aws.csproj]
Iam/InstanceProfile.cs(142,10): error CS0246: The type or namespace name 'Obsolete' could not be found (are you missing a using directive or an assembly reference?) [/Users/stack72/code/go/src/github.com/pulumi/pulumi-aws/sdk/dotnet/Pulumi.Aws.csproj]
```
* Fix the nullability of config type properties in C# codegen (#4379)
These changes add a package for type checking and modeling HCL2
configurations. It is made up of three primary components:
1. A static type system
2. A semantic representation of HCL2 expressions and a binder from HCL2
native syntax to this representation
3. A semantic representation of HCL2 structural elements and binders
from HCL2 native syntax to this representation.
The type system is described in the "Extended Types" section of the
specification. The semantic representations of expressions and
structural elements are documented in their implementations.
