remove this

[andrewrk]

This feature was used for these things:

• For structs which are created with comptime parameters to reference the type:

pub fn AlignedArrayList(comptime T: type, comptime A: u29) type {
    return struct {
        const Self = this;
...

• For builtin functions to refer to a "scope" type:

[nix-shell:~/downloads/zig/build]$ grep -RI setFloatMode ../std/
../std/math/pow.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/expm1.zig:    @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/expm1.zig:    @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/tan.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/sinh.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/ln.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/ln.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/complex/exp.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/floor.zig:        @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/floor.zig:        @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/exp2.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/exp2.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/exp.zig:    @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/exp.zig:    @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/cos.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/round.zig:        @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/round.zig:        @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/sin.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);
../std/math/ceil.zig:        @setFloatMode(this, builtin.FloatMode.Strict);
../std/math/ceil.zig:        @setFloatMode(this, builtin.FloatMode.Strict);
../std/fmt/errol/index.zig:    @setFloatMode(this, @import("builtin").FloatMode.Strict);

Here's my proposal to replace these uses:

• Provide builtin function for getting the current type: @ThisType() - searches up in scope until it finds a struct, union, enum, or error, and returns that type.
• Remove the scope parameter from the builtin functions such as @setFloatMode. We were always passing this anyway.

[thejoshwolfe]

I use this to refer to the top level scope also. Would @ThisType() give me the global namespace outside of any other type?

[andrewrk]

With #1047 it certainly would. Probably even without that proposal, it would refer to the namespace as you said.