add errorshow for DimensionMismatch (#44121)

Close #44117
JuliaLang · Feb 13, 2022 · befe38f · befe38f
1 parent 1813978
commit befe38f
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diff --git a/base/docs/basedocs.jl b/base/docs/basedocs.jl
@@ -365,7 +365,7 @@ julia> push!(a, 2, 3)
 Assigning `[]` does not eliminate elements from a collection; instead use [`filter!`](@ref).
 ```jldoctest
 julia> a = collect(1:3); a[a .<= 1] = []
-ERROR: DimensionMismatch("tried to assign 0 elements to 1 destinations")
+ERROR: DimensionMismatch: tried to assign 0 elements to 1 destinations
 [...]
 
 julia> filter!(x -> x > 1, a) # in-place & thus more efficient than a = a[a .> 1]

diff --git a/base/errorshow.jl b/base/errorshow.jl
@@ -152,6 +152,7 @@ showerror(io::IO, ex::KeyError) = (print(io, "KeyError: key ");
  print(io, " not found"))
 showerror(io::IO, ex::InterruptException) = print(io, "InterruptException:")
 showerror(io::IO, ex::ArgumentError) = print(io, "ArgumentError: ", ex.msg)
+showerror(io::IO, ex::DimensionMismatch) = print(io, "DimensionMismatch: ", ex.msg)
 showerror(io::IO, ex::AssertionError) = print(io, "AssertionError: ", ex.msg)
 showerror(io::IO, ex::OverflowError) = print(io, "OverflowError: ", ex.msg)
 

diff --git a/stdlib/LinearAlgebra/docs/src/index.md b/stdlib/LinearAlgebra/docs/src/index.md
@@ -266,7 +266,7 @@ julia> b = [1 2 3; 4 5 6]
  4 5 6
 
 julia> b - U
-ERROR: DimensionMismatch("matrix is not square: dimensions are (2, 3)")
+ERROR: DimensionMismatch: matrix is not square: dimensions are (2, 3)
 Stacktrace:
 [...]
 ```