Nicer error for forward api

[bitmyte]

No description provided.

[wsmoses]

Fixes #451

[codecov-commenter]

Codecov Report

Base: 72.87% // Head: 76.16% // Increases project coverage by +3.28% 🎉

Coverage data is based on head (6510e6a) compared to base (6001c83).
Patch coverage: 85.71% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #469      +/-   ##
==========================================
+ Coverage   72.87%   76.16%   +3.28%     
==========================================
  Files          17       17              
  Lines        4878     4989     +111     
==========================================
+ Hits         3555     3800     +245     
+ Misses       1323     1189     -134     

Impacted Files	Coverage Δ
src/Enzyme.jl	86.25% <85.71%> (+0.03%)	⬆️
src/compiler/pmap.jl	77.54% <0.00%> (-5.22%)	⬇️
src/compiler/optimize.jl	93.01% <0.00%> (-4.84%)	⬇️
src/compiler/orcv2.jl	61.90% <0.00%> (-4.43%)	⬇️
src/typetree.jl	87.30% <0.00%> (+1.58%)	⬆️
src/compiler.jl	75.54% <0.00%> (+1.77%)	⬆️
src/api.jl	60.10% <0.00%> (+3.82%)	⬆️
src/compiler/validation.jl	62.06% <0.00%> (+5.95%)	⬆️
src/compiler/interpreter.jl	100.00% <0.00%> (+36.36%)	⬆️
... and 2 more

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