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| -rw-r--r-- | src/doc/rustc-dev-guide/src/rustc-driver-interacting-with-the-ast.md | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/doc/rustc-dev-guide/src/rustc-driver-interacting-with-the-ast.md b/src/doc/rustc-dev-guide/src/rustc-driver-interacting-with-the-ast.md index 51d5cb6d30f..1749c9db413 100644 --- a/src/doc/rustc-dev-guide/src/rustc-driver-interacting-with-the-ast.md +++ b/src/doc/rustc-dev-guide/src/rustc-driver-interacting-with-the-ast.md @@ -4,6 +4,10 @@ ## Getting the type of an expression +NOTE: For the example to compile, you will need to first run the following: + + rustup component add rustc-dev + To get the type of an expression, use the `global_ctxt` to get a `TyCtxt`: ```rust |