It is possible to get comptime-known values from runtime-known values
for example the length of array. Allowing runtime only instructions to
be emitted outside function bodies allows these operations to happen.
In places where comptime-known values are required we have other methods
to ensure that and they usually result in more specific compile errors too.
Closes#12240
expected type 'fn() void', found 'fn(i32) void'
function with 0 parameters cannot cast into a function with 0 parameters
=>
expected type 'fn() void', found 'fn(i32) void'
function with 1 parameters cannot cast into a function with 0 parameters
* the root struct decl name is fully qualified
this prevents error messages containing 'main.main'
* avoid declared here note when file struct is missing a member
It always points at the start of the file which might contain another
container misleading the user.
The enum we want to get the fields from might not be declared in the
same file as the block we are analyzing, so we should get the AST from
the decl's file instead.
Closes#12950.
Many of these tests check for the incorrect behavior of stage1 whereas
self-hosted correctly does not emit an error, so they are simply
deleted.
The remaining number of test cases within the stage1/ subdirectory is
reduced from 143 to 103.
Storing defers this way has the benefits that the defer doesn't get
analyzed multiple times in AstGen, it takes up less space, and it
makes Sema aware of defers allowing for 'unreachable else prong'
error on error sets in generic code.
The disadvantage is that it is a bit more complex and errdefers with
payloads now emit a placeholder instruction (but those are rare).
Sema.zig before:
Total ZIR bytes: 3.7794370651245117MiB
Instructions: 238996 (2.051319122314453MiB)
String Table Bytes: 89.2802734375KiB
Extra Data Items: 430144 (1.640869140625MiB)
Sema.zig after:
Total ZIR bytes: 3.3344192504882812MiB
Instructions: 211829 (1.8181428909301758MiB)
String Table Bytes: 89.2802734375KiB
Extra Data Items: 374611 (1.4290275573730469MiB)
