Files
rust/src/libsyntax
bors e38554cd80 Auto merge of #51145 - petrochenkov:npbot, r=alexcrichton
resolve: Make sure indeterminate and inconsistent macro resolutions always generate errors

Addresses the issue described in https://github.com/rust-lang/rust/pull/50911#issuecomment-392560525

I haven't come up with a minimized reproduction yet, but confirmed that `npbot` now generates the correct error with `![feature(use_extern_macros)]`.
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The syntax crate contains those things concerned purely with syntax that is, the AST ("abstract syntax tree"), parser, pretty-printer, lexer, macro expander, and utilities for traversing ASTs.

For more information about how these things work in rustc, see the rustc guide: