I just realised another small benefit of showing the full URL in the sigil. 
Here’s a snippet from the proposal as rendered by my e-mail client:



The URL was automatically made clickable. Tools like Livebook could potentially 
do the same.

> On 16 May 2023, at 10:38, Wojtek Mach <woj...@wojtekmach.pl> wrote:
> 
> Hi, I'd like to propose adding ~URI for constructing URI structs. Here's an 
> example:
> 
>     iex> ~URI"https://elixir-lang.org";
>     %URI{
>       scheme: "https",
>       authority: "elixir-lang.org",
>       userinfo: nil,
>       host: "elixir-lang.org",
>       port: 443,
>       path: nil,
>       query: nil,
>       fragment: nil
>     }
> 
> I believe the advantage is we can make this a macro and thus parse the URI 
> string at compile-time
> so catch bugs because of incorrect format early (though these are pretty 
> uncommon) and also be a
> little bit more efficient at runtime.
> 
> If added, I'm not sure whether ~URI should use URI.parse or URI.new! under 
> the hood so an advice
> on that would be appreciated.
> 
> This is a separate but related discussion so while at it, I'd like to propose 
> adding Inspect
> implementation for URI that would return the sigil:
> 
>     iex> ~URI"https://elixir-lang.org";
>     ~URI"https://elixir-lang.org";
> 
> I think more compact representation helps e.g. here. Before:
> 
>     iex> Req.new(url: "https://elixir-lang.org";)
>     %Req.Request{
>       method: :get,
>       url: %URI{
>         scheme: "https",
>         authority: "elixir-lang.org",
>         userinfo: nil,
>         host: "elixir-lang.org",
>         port: 443,
>         path: nil,
>         query: nil,
>         fragment: nil
>       },
>       headers: [],
>       body: nil,
>       options: %{},
>       ...
>     }
> 
> After:
> 
>     iex> Req.new(url: "https://elixir-lang.org";)
>     %Req.Request{
>       method: :get,
>       url: ~URI"https://elixir-lang.org";,
>       headers: [],
>       body: nil,
>       options: %{},
>       ...
>     }
> 
> On the other hand, seeing the internal representation right away is sometimes 
> useful given the URI
> format is somewhat subtle.
> 
> Before:
> 
>     iex> URI.parse("/foo")
>     %URI{
>       scheme: nil,
>       userinfo: nil,
>       host: nil,
>       port: nil,
>       path: "/foo",
>       query: nil,
>       fragment: nil
>     }
>     iex> URI.parse("//foo")
>     %URI{
>       scheme: nil,
>       authority: "foo",
>       userinfo: nil,
>       host: "foo",
>       port: nil,
>       path: nil,
>       query: nil,
>       fragment: nil
>     }
> 
> After:
> 
>     iex> URI.parse("/foo")
>     ~URI"/foo"
>     iex> URI.parse("//foo")
>     ~URI"//foo"
> 
> I think this downside can be alleviated by adding `IEx.Info` implementation 
> along these lines:
> 
>     iex> i URI.parse("/foo")
>     Term
>       ~URI"/foo"
>     Data type
>       URI
>     Raw representation
>       %URI{
>         scheme: nil,
>         userinfo: nil,
>         host: nil,
>         port: nil,
>         path: "/foo",
>         query: nil,
>         fragment: nil
>       }
> 
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