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Provide helpful diagnostics for shebang lookalikes When `[` is not found after a `#!`, a note will be added to the exisiting error ``` error: expected `[`, found `/` --> src/main.rs:2:3 | 2 | #!/usr/bin/env -S cargo +nightly -Zscript | ^ expected `[` | = note: the token sequence `#!` here looks like the start of a shebang interpreter directive but it is not = help: if you meant this to be a shebang interpreter directive, move it to the very start of the file ``` Fixes #137249 r? `@fmease`