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AstGen: pre-scan all decls in a namespace

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Also:
 * improve the "ambiguous reference" error by swapping the order of
   "declared here" and "also declared here" notes.
 * improve the "not accessible from inner function" error:
   - point out that it has to do with the thing being mutable
   - eliminate the incorrect association with it being a function
   - note where it crosses a namespace boundary
 * struct field types are evaluated in a context that has the struct
   namespace visible. Likewise with align expressions, linksection
   expressions, enum tag values, and union/enum tag argument
   expressions.

Closes #9194
Closes #9622
This commit is contained in:
Andrew Kelley
2021-08-28 15:15:46 -07:00
parent 05cf44933d
commit 4bb5d17edc
6 changed files with 182 additions and 140 deletions
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5
src/Module.zig
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@@ -2648,7 +2648,10 @@ pub fn astGenFile(mod: *Module, file: *Scope.File) !void {
undefined;
defer if (data_has_safety_tag) gpa.free(safety_buffer);
const data_ptr = if (data_has_safety_tag)
@ptrCast([*]const u8, safety_buffer.ptr)
if (file.zir.instructions.len == 0)
@as([*]const u8, undefined)
else
@ptrCast([*]const u8, safety_buffer.ptr)
else
@ptrCast([*]const u8, file.zir.instructions.items(.data).ptr);
if (data_has_safety_tag) {