The implementation accompanying the thesis "Improving Error Messages for Dependent Types with Constraint Based Unification", by Joseph Eremondi.

This code is a mismash of three existing projects:

• LambdaPi, whose files are in the /src directory
• Gundry-McBride Unification, whose files are in the /src/PatternUnify directory
• Helium, whose files are in the src/Top directory.

Notable modules include:

• ConstraintBased, a type-checking procedure generates constraints to be solved
• Constraint, where LambdaPi constraints and values are converted into Gundry-McBride form
• PatternUnify.Tm, where we define a value-form Lambda Calculus
• PatternUnify.Context, where we define the Gundry-McBride metacontext and operations on it
• PatternUnify.Unify, where the actual Gundry-McBride algorithm is implemented
• Top.Implementation.TypeGraph.Standard, the main type-graph implementation
• Top.Implementation.TypeGraph.DefaultHeuristics, where we implement a few heuristics used in error generation