fix: Don't panic when checking if an undeclared variable is mutable #1987
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Description
Problem*
Resolves #1985
Summary*
We were trying to grab the definition of a variable that wasn't defined previously, leading to a compiler panic. I've added a
try_definitionfunction to avoid this and went through and removed any other usage of the panickingdefinitionmethod from name resolution and type inference.Documentation
This PR requires documentation updates when merged.
Additional Context
PR Checklist*
cargo fmton default settings.