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Proof step 5 from proof substring-offset-rec (previous step)

str = char + str0 ⊦ str = "", substring(str, m0 + 1, n) = substring(str0, m0, n)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
⊦ char ' + str0 = "", substring(char ' + str0, m0 + 1, n) = substring(str0, m0, n)

Rule argument

Additional information

Used simplifier rules: chartostring-01: ⊦ char + str = char ' + str; from specification string-append